Question

he shook his head regretfully change into past perfect tense​

Answer 1

He had shaken his head regretfully.

Answer 2

Concept introduction:

Past perfect tense is where the action has been started and completed in the past only.

Explanation:

Given that, the sentence 'he shook his head regretfully'.

We have to find, past perfect tense​ of the given sentence.

According to the question,

Past perfect tense​ of the given sentence is:

He had shaken his head regretfully.

Final Answer:

He had shaken his head regretfully.

#SPJ3