Question

He objected to my proposal (use verb form)

Answer 1

Answer:

he had objected to my proposal

Answer 2

Answer:

The verb form of the word proposal is propose.  So the sentence has to be written with the word propose without changing its meaning. One of the options of writing the sentence with verb form of proposal is ‘what I proposed for, he objected at that’. In this way the verb form of the word proposal can be used in the sentence.