B1: Present Perfect Simple Quiz

The correct choice is 'hasn't finished' because it uses the present perfect tense, indicating that Sarah has not completed her homework up to now. The other options do not fit the context or tense required.

The correct choice is 'have been' because it agrees with the plural subject 'they' and indicates an action that occurred at unspecified times in the past. 'Has been' is singular, 'had been' implies a past perfect tense, and 'were' is simple past.

The correct choice is 'Have ... eaten' because 'have' is used with 'you' in questions, and 'eaten' is the past participle of 'eat'. 'Has' is incorrect for 'you', and 'ate' is the simple past form, not suitable here.

The correct choice is 'has lost' because it indicates a recent action affecting the present. 'Have lost' is incorrect for 'John', 'had lost' suggests a past action, and 'was losing' implies an ongoing action, not a completed one.

The correct choice is 'have known' because it indicates an action that started in the past and continues to the present, fitting the context of knowing each other for ten years.

The correct choice is "hasn't arrived" because it uses the present perfect tense, indicating that the train has not yet arrived up to the present moment. The other options are grammatically incorrect or do not fit the context.

The correct choice is 'have ... studied' because the subject 'you' requires the auxiliary verb 'have' in the present perfect tense. 'Studied' is the past participle form of 'study', making this option grammatically correct.

The correct choice is 'have ... been' because 'I' is a first-person singular subject, requiring 'have' in the present perfect tense. 'Been' is the correct past participle of 'be' for indicating experience.

The correct choice is 'has ... returned' because 'she' is a singular subject, requiring the singular verb 'has' and the past participle 'returned' to indicate a completed action.

The correct choice is 'Have ... heard' because 'you' is a second-person pronoun, which requires 'have' for the present perfect tense. 'Heard' is the past participle of 'hear', making the phrase grammatically correct.