How do you form the perfect tense of a verb?

A: Use the helping verb will and the base form of the word?

B: Use a form of the verb be and the past participle of the verb?

C: Use a form of the verb have and the present participle of the verb?

D: Use a form of the verb have and the the past participle of the verb.

I think it is C

If you choose C, then this would be correct:

They have skiing in the mountains all their lives.

Is that correct?

No, then it's D.

You are close, but the correct answer is actually D: Use a form of the verb have and the past participle of the verb.

To form the perfect tense of a verb, you need to use a form of the helping verb "have" along with the past participle of the main verb. The helping verb "have" changes depending on the subject and tense of the sentence. For example, in the present perfect tense, you would use "have" for the first and second person singular (I, you) and "has" for the third person singular (he, she, it) along with the past participle of the verb.

Here are some examples in the present perfect tense:
- I have eaten dinner.
- She has finished her homework.

In the past perfect tense, you would use "had" along with the past participle of the verb:
- He had already left before I arrived.

So, to form the perfect tense of a verb, remember to use a form of the verb "have" and the past participle of the main verb.