Question

Singh applied it in a wide spectrum of areas rewrite using past perfect tense if the verb

Answer 1

Singh had applied it in a wide spectrum of areas

Answer 2

Using the past perfect tense, the correct answer is:

Singh had applied it in a wide spectrum of areas.

The past perfect tense is used to talk about things that happened in the past. Therefore, the past perfect tense depends on the past tense of “have”. Which signifies time and action.