You can ask for help whenever you need it.

　　你如果需要幫助隨時可以提出來。

　　I know that this is a bad time to ask for help.

　　我知道在這時候要求幫助不合適。

　　Why didn't you ask for help, rather than trying to do it on your own?

　　你干嗎非得自己干，而不請人幫忙？