Present Perfect Or Past Simple?

Explanation
The correct answer is "has known" because the sentence is in the present perfect tense, which is used to talk about actions or situations that started in the past and continue to the present. In this case, George started knowing Jonathan in the past when they were at school, and this knowledge continues up until now.

Explanation
The verb "have visited" is the present perfect tense of the verb "visit." In this sentence, the speaker is referring to a past action that has a connection to the present. The use of "have" indicates that the action of visiting Paris has occurred at some point in the past, but the specific times are not mentioned. Therefore, "have visited" is the correct answer.

Explanation
The correct answer is "saw" because the sentence is in the past tense and "saw" is the past tense form of the verb "see". This indicates that the action of seeing a musical took place in the past when the person was in London.

Explanation
In 2012, Obama was elected for the second time. This implies that he won the presidential election and was chosen by the people to serve as the President for another term. The phrase "was elected" indicates the action of being chosen through a democratic process, confirming that Obama secured the necessary votes to continue his presidency.

Explanation
The correct answer is "has not answered" or "hasn't answered" because both options indicate that the action of not answering the question is still ongoing. The verb "has" is used with "not" to form the negative present perfect tense, indicating that the action of answering has not yet occurred. The contraction "hasn't" is a shortened form of "has not" and has the same meaning.

Explanation
Dante is the subject of the sentence, and the verb "wrote" is in the past tense, indicating that the action of writing has already occurred. Therefore, the correct answer is "wrote," as it agrees with the subject and tense of the sentence.

Explanation
The question is asking for the worst disaster movie that the person has seen. The correct answer is "have seen" or "have ever seen" because both verb tenses are used to indicate an action that has occurred in the past. "Have seen" implies that the person has seen a disaster movie at some point in the past, while "have ever seen" emphasizes that the person is referring to the worst disaster movie they have seen in their entire life.

Explanation
The correct answer is "met" because it is the past tense form of the verb "meet" and matches with the past time frame indicated by "last night".

Explanation
The correct answer is "began." This is the past tense form of the verb "begin." The sentence is describing an action that started in the past, specifically when the person was walking home.

Explanation
The correct answer is "have lost" because the sentence is in the present perfect tense. The verb "have" is used as an auxiliary verb to form the present perfect tense, and "lost" is the past participle of the verb "lose". This tense is used to describe an action that started in the past and has a connection to the present moment. In this case, the speaker is talking about losing their keys, which is an action that happened in the past but is still relevant to the present because they are asking if the keys have been found.