Question

a bridge would have been built if the funds had not run out (had the....)​

Answer 1

If the funds had not run out, a bridge would have been built.

Explanation:

The below sentence is two clause sentence of past.

It contains "If clause" and "Main clause".

The first case of the sentence contains the main clause first and the if clause latter.

First case:

A bridge would have been built if the funds had not run out.

Second case:

Similarly the sentence can be restructure by starting it with If clause and ending with main clause.

If the funds had not run out, a bridge would have been built.