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Don't disturb Tony! He ____________ (to write) a letter at the moment.
a. write
b. is writing
c. writes
d. has written
Correct Answer: b. is writingExplanation
The phrase 'at the moment' means that the action is happening at this certain moment, right now. So, in this case we should always use the Present Continuous Tense. This Tense is formed: am/is/are + Verb-ing
Rachel __________ (to be) in Frankfurt since Sunday.
a. has been
b. is
c. is being
d. be
Correct Answer: a. has beenExplanation:
The action in this sentence started in the Past (on Monday) and continues in the Present. It means that Rachel is still in Frankfurt. In this case we should use the Present Perfect Tense: has/have + Verb (-ed/Irregular)
Past tense?