My notes tell me they should be parallel for example : just as gills are to fish, so lungs are to humans.

This is understandable but is this one acceptable:

Just as Eating apples were prohibited, so were bananas.

I mean now it is not parallell but it looks fine .

Ps. I can initiate new thread but not reply because there is no such button as quote or reply. I will reply in other threads as soon i sit on computer.