TOEFL Grammar Quiz: Sentence Structure and Word Order

"Must be known" is the correct passive modal construction because the sentence describes a current policy condition — what information may be disclosed — requiring the simple present passive form. "Must have known" is an active past modal implying prior knowledge, which does not fit a present regulatory context. "Must have been known" is a past passive modal suggesting something should have been known previously, shifting the meaning away from a current standing rule. "Must have been being known" is grammatically non-standard and has no recognized use in formal written English.

"Which modules to teach" correctly uses an interrogative word followed by a to-infinitive to express uncertainty about a specific choice, which is a standard embedded question structure following verbs of uncertainty. "Which modules teach" omits the infinitive marker "to," leaving the clause grammatically incomplete. "Why modules to teach" uses "why" to introduce a reason, which does not logically address uncertainty about content selection. "When modules to teach" introduces a time reference that is irrelevant to the context of choosing training content.

"Whose entry was the strongest" correctly uses the possessive relative pronoun "whose" to indicate that the entry belongs to a particular person, forming a grammatically correct embedded question. "Who's entry" incorrectly uses the contraction "who's" — meaning "who is" — in place of the possessive pronoun "whose." "Entry who was the strongest" places the noun before the relative pronoun, producing an illogical and ungrammatical sequence. "The strongest entry was who" reverses the natural word order of the embedded question, making it grammatically incoherent.

"The sharp acrid smell of leaking chemicals" follows the correct English adjective order, placing the opinion adjective "sharp" before the descriptive adjective "acrid," then the noun "smell," followed by the noun phrase "leaking chemicals." "The acrid sharp smell" reverses the adjective order, placing the descriptive adjective before the opinion adjective, which is non-standard. "The sharp acrid smell of chemicals leaking" repositions "leaking" after "chemicals," which disrupts the natural compound modifier "leaking chemicals." "The sharp smell acrid" places the adjective after the noun, which does not follow standard English word order.

"He really enjoys" provides the correct subject-verb structure for the clause following "because," with the adverb "really" placed between the subject and the main verb "enjoys," which appropriately describes active engagement with the work. "Has really he" inverts the subject and auxiliary, producing a question word order that is grammatically incorrect in a subordinate clause. "He really has" uses the auxiliary "has" without a main verb, leaving the clause semantically incomplete. "Is he really" produces an inverted question structure that cannot function as a subordinate clause introduced by "because."

"Be taken seriously" is correct because the passive construction requires the past participle "taken" after the modal passive auxiliary "be," and the adverb "seriously" correctly modifies the participle "taken." "Be took serious" uses the simple past "took" instead of the past participle "taken," and the adjective "serious" cannot modify a verb. "Be took seriously" also incorrectly uses "took" instead of the required past participle "taken." "Be taken serious" uses the adjective "serious" where the adverb "seriously" is required to modify the verb.

"Quickly retracted" is the correct simple past active construction, indicating that the official withdrew the remarks promptly in response to criticism. "Quickly retracted to" adds an unnecessary preposition that has no grammatical function after "retracted." "Quickly was retracted" uses passive voice, implying the remarks were withdrawn by someone other than the official. "Quickly has retracted" uses the present perfect, which does not align with the completed past event established by the sentence context.

"What time the first ferry departs" correctly maintains declarative word order — subject before verb — as required in embedded indirect questions. Indirect questions do not use inverted word order even when the main clause is itself a question. "What time departs the first ferry" incorrectly inverts the subject and verb as if forming a direct question. "When departs the first ferry" also incorrectly inverts subject and verb and replaces the specific "what time" with the broader "when." "When departs the ferry" omits the determiner "first," incorrectly inverts word order, and uses the less precise "when" in place of "what time."

"Completely unprofessional behavior" follows the correct English word order in which an adverb modifies an adjective, which in turn modifies a noun — adverb plus adjective plus noun. "Completely" correctly modifies "unprofessional," and "unprofessional" correctly modifies "behavior." "Completely behavior unprofessional" separates the adverb from the adjective it modifies and places the adjective after the noun. "Behavior completely unprofessional" places the noun before its modifiers, reversing the standard adjective-before-noun order in English. "Unprofessional completely behavior" inserts the adverb between the adjective and the noun, breaking the standard modifier sequence.

"Could easily be interpreted" is the correct modal passive construction, combining the modal "could," the adverb "easily," the passive auxiliary "be," and the past participle "interpreted." "Could been interpreted" omits the auxiliary "be" required between the modal and the past participle. "Could be interpret" uses the base verb form "interpret" instead of the required past participle "interpreted." "Could easily interpreted" omits the passive auxiliary "be," leaving the construction grammatically incomplete.

"How she resolved it" correctly functions as a noun clause subject using declarative word order — subject before verb — as required when a clause functions as the subject of a sentence. "How did she resolve it" uses inverted direct question word order, which is grammatically incorrect when the clause serves as a sentence subject rather than a standalone question. "What she resolved it" uses "what" alongside the redundant object pronoun "it," creating an ungrammatical double object. "When did she resolve it" applies incorrect inverted word order and introduces a time reference rather than addressing the manner of resolution.

"An exceptionally stunning rare portrait" follows the correct English adjective sequence — adverb modifying opinion adjective, followed by descriptive adjective, then noun. "Exceptionally" intensifies "stunning" as the opinion adjective, and "rare" functions as a descriptive adjective before the noun "portrait." "An exceptionally rare stunning portrait" places the descriptive adjective "rare" before the opinion adjective "stunning," reversing the standard order. "A rare exceptionally stunning portrait" also misplaces "rare" before the adverb-opinion adjective pair. "A stunning portrait exceptionally rare" places the noun before its post-nominal modifiers, which is not standard English word order in this context.

"Is regarded as" is the correct fixed passive phrase because it introduces the characterization that follows — the timeframe of the movement's emergence — and "as" is required to link the passive verb to its complement. "Is regarded" is incomplete without "as," which is obligatory in this construction. "Is regarding" uses the present continuous of an active verb, which is grammatically incorrect in a passive characterization. "Regarded as" omits the auxiliary "is," leaving the sentence without a complete finite predicate.

"If the instructor has" correctly introduces an embedded indirect question using "if" to signal uncertainty, followed by the subject "the instructor" and the present perfect auxiliary "has." "The instructor has" omits the subordinating conjunction needed to introduce an indirect question within the main clause. "The instructor hasn't" introduces a negative statement rather than expressing open uncertainty. "Whether instructor" omits the article "the" before "instructor" and lacks the auxiliary verb needed to complete the embedded clause.

"Did they begin to ask" correctly applies subject-verb inversion triggered by the fronted restrictive adverbial "only after," placing the auxiliary "did" before the subject "they." "Begin to ask" correctly captures the initiation of inquiry following the completion of the document review. "Did they ask to begin" reverses the logical sequence — asking to begin would precede the review, not follow it. "They did begin to ask" fails to apply the required inversion after the fronted adverbial. "To ask did they begin" produces a non-standard and unnatural word order that does not reflect recognized English inversion rules.

"Do you know where I should file this report?" is correct because "where I should file this report" is an embedded indirect question functioning as the object of "know." Indirect questions always follow declarative word order — subject before verb — regardless of whether the main clause is itself a question. "Do you know where should I file this report?" incorrectly applies direct question inversion inside the embedded clause, placing the modal "should" before the subject "I." This is a common learner error arising from treating the embedded clause as a direct question, but it is grammatically incorrect in standard English.