Select either the past tense or the present perfect form in the following sentences. 1. Mr. Johnson left/has left last week for a business trip.(1)
2. Sam lost/has lost his car keys and can’ get home.(1)
3. The choir sang/has sung that song a hundred times.(1)
4. We moved/have moved there ten years ago.(1)
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1. Mr. Johnson has left last week for a business trip.

In this sentence, we should use the present perfect form "has left" because the action of Mr. Johnson leaving occurred in the past, but it has a connection to the present because he went on a business trip and is still on that trip.

2. Sam has lost his car keys and can't get home.

Here, we use the present perfect form "has lost" because the action of losing the car keys happened in the past, but it has an impact on the present situation, as Sam is currently unable to get home.

3. The choir has sung that song a hundred times.

We use the present perfect form "has sung" because the action of the choir singing the song happened multiple times in the past, but it has a connection to the present because they have done it a hundred times.

4. We moved there ten years ago.

In this sentence, we use the past tense "moved" because the action of moving to a new place happened at a specific time in the past (ten years ago), and it does not have any connection to the present.

Remember, it is important to analyze the context of the sentence and consider if the action has a connection to the present or if it is a past action with a specific time reference.