I would like to discuss (really, slightly modified from) this phrase. This is a conversation.

Is targeting small structures hard to distinguish?

What is important to understand grammatically?

I’m not sure why I think B is better, but I can explain it better.

I think the problem can be simplified to the difference between the following ml

Examples: C) small structures are hard to

distinguish D) small structures are hard to be

distinguish It’s about what is the subject for the verb “distinguish”. What is new in this subject?

How difficult is it for a man to learn how to program for an hour?