Choose the correct verb form to complete these sentences. 1) I her last year.
didn't see
haven't seen

2) Nobody the phone when it rang.
has answered
answered

3) He a letter by 6 pm yesterday.
had written
has wrote

1) I haven't seen her last year.

The correct verb form is "haven't seen." This is because the action of seeing the person took place in the past and is connected to the present. When we use the present perfect tense, we use the auxiliary verb "have" (here in the past participle form "haven't") followed by the main verb in the past participle form ("seen").

2) Nobody answered the phone when it rang.

The correct verb form is "answered." This is because the action of answering the phone took place in the past and is completed. We use the simple past tense here, which is formed by adding "-ed" to the base form of the verb.

3) He had written a letter by 6 pm yesterday.

The correct verb form is "had written." This is because the action of writing the letter took place before another past event specified in the sentence (by 6 pm yesterday). We use the past perfect tense here, which is formed by using the auxiliary verb "had" followed by the past participle form of the main verb ("written").