Task 3. Choose the right verb forms to complete the sentences. 1) The day before yesterday we (visited/have visited) the Niagara Falls.
2) We have already (finished/have finished) writing the test.
3) She (has not read/did not read) the story yet.
4) When (did you travel/has you travelled) about the USA?
5) (Have you done/Did you do) the exercise yet?

1) The day before yesterday we *visited* the Niagara Falls.
Explanation: Since the action happened in the past, we use the past simple tense "visited" to indicate that the visit to the Niagara Falls is completed.

2) We have already *finished* writing the test.
Explanation: "Have already" indicates that the action of finishing writing the test has happened in the past and still has relevance to the present. We use the present perfect tense "have finished" to convey this.

3) She *has not read* the story yet.
Explanation: "Has not" indicates the negative form of the present perfect tense. We use the present perfect tense "has read" to indicate that the action of reading the story has not happened up until now.

4) When *did you travel* about the USA?
Explanation: "When" indicates the past time frame. We use the past simple tense "did you travel" to indicate the action of traveling in the past.

5) *Have you done* the exercise yet?
Explanation: "Have you done" is the present perfect form used to ask about the completion of an action in the past with relevance to the present. In this case, we ask if the exercise is completed.