Question

We can never forget his kindness to us. Interogative

Answer 1

Given sentence

We can never forget his kindness to us.

This sentence is negative. Let's convert it first to assertive

=> We can forget his kindness to us.

While converting to interrogative, modals, auxiliary verbs etc comes first. Then the subject, then comes the predicate followed by a question mark.

Hence your answer is :-

Can we forget his kindness to us?

Hope it helps dear friend ☺️✌️