Question

effort was made by him (change into present perfect tense)​

Answer 1

Answer:

Effort has been made by him

Explanation:

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Answer 2

The present perfect tense of "effort was made by him" would be:

*He has made an effort.

This sentence conveys that he made an effort in the past, and that the result or impact of that effort is relevant to the present moment. The verb "make" is irregular, so the past participle form is the same as the base form. Note that the subject of the sentence has changed from "him" to "he" because the sentence has been rephrased in the active voice.