These are tough, so please be patient. :wink:
That is good. :DDon't Hesitate to Say "No"
You need to make some changes there. First, it should be asks. Second, I think should would be better than can. Thus it would be:When someone ask us for help, under what situation we can say "No"?
- When someone asks us for help, under what situations should we say "No"?
That's good, but I think it could be more clear. Perhaps:I think the decision depends on the way to help. If you help someone but do harm to another simultaneously, please don't hesitate to say "No".
- I think the decision depends on the situation. If by helping someone you do harm to someone else you should not hesitate to say no.
(Using quotes is fine if you can't make italics or even if you can.)