TOEFL Review Of Skill 1-42

The error lies in the verb “has,” which creates an incorrect tense. The sentence refers to a past habitual action, so the correct form should be “walked,” not “has walked.” Present perfect tense is inappropriate here because it suggests continuity into the present. This question tests understanding of verb tense consistency, especially when describing historical or repeated past actions in English grammar.

“That” is correct because it introduces a defining clause referring to steamboats. “Which” would require commas, and other options are incomplete or redundant. This question tests relative clause usage. Understanding when to use “that” versus “which” is important for constructing precise and grammatically correct sentences in formal English.

“Many” is incorrect because it should be “much” or “most.” “Many” is used for countable nouns, while “food” is uncountable. This question tests quantifier usage. Choosing the correct quantifier ensures grammatical accuracy and prevents awkward phrasing in both spoken and written English.

The word “project” is incorrect because it should be plural as “projects.” The subject refers to multiple spacecraft programs, requiring plural agreement. Using singular form creates a subject-verb mismatch. This question checks understanding of noun number agreement. Recognizing whether a subject is singular or plural is essential for maintaining grammatical accuracy in sentence construction.

The word “diseased” is incorrect and should be “diseases.” “Diseased” is an adjective, while the sentence requires a noun. This question tests part-of-speech recognition. Understanding whether a sentence needs a noun, verb, or adjective is critical for correct grammar usage. Using the wrong form changes the meaning and makes the sentence grammatically incorrect.

“Elections are” is the correct choice because the subject is plural and requires a plural verb. The sentence describes a recurring event, so present simple tense is appropriate. Other options either misuse verb forms or fail to complete the sentence logically. This question tests subject-verb agreement and correct verb usage in general statements about scheduled events.

“Differences” is correct because the sentence refers to multiple variations in susceptibility. Singular forms or incorrect verb combinations disrupt meaning. This question tests plural noun usage and sentence completion. Recognizing when plural forms are needed ensures clarity and accuracy, especially in academic or scientific contexts where precision is important.

“Does it limit” correctly maintains parallel structure with the earlier clause. The sentence uses a negative structure requiring auxiliary verb support. Other options break grammatical consistency. This question tests understanding of parallelism and auxiliary verb usage. Maintaining consistent sentence structure is essential for clarity and formal writing accuracy.

“Soon will be” correctly indicates a future outcome based on current trends. The sentence describes an ongoing situation leading to a predicted result. Other options are either grammatically incorrect or illogical. This question evaluates future tense usage and logical progression in sentence construction, ensuring the learner understands how to express predictions clearly.

The error is “indicates,” which should be “is indicated.” The sentence requires passive voice because temperature is being described, not performing the action. This question tests voice recognition. Understanding when to use active versus passive constructions is important for clarity, especially in technical or scientific descriptions.