Question

we can gain nothing without industry(change in to passive voice )

Answer 1

Bro here is your answer:-

✓Without industry nothing could be gained by us

Answer 2

Explanation:

Nothing can be gained without the industry. From an active voice the sentence is changed to a passive voice. Here there is an object which is an active sentence. In the passive sentence this transforms to become the subject.  So some rules are there which are utilized to convert sentences from one voice to another. These help in keeping the meaning same.