what‘s the difference about "went" "gone" "been" ? could you give me examples?~~~please~~~and thank u so much!

which one is the right one? it's a good way to loosen me up and to keep fit it's a good way to loosen me up and keep fit

how to translate this sentence in English???? 我觉得有爱好是好事，但前提是能养活自己，只有先满足最基本的需求。才有精力去发展自己的爱好。所以我会在自己稳定下来之后去做。

cause=because???

can i say 'the office staff'?or 'office staffs' or ' office thaffs'?which on is ture? but if i don't plus "s"at the end of the staff,why people say "the theaters"?and ,sometime the+XX is means one type of things like :the old ,how to distinguish them?

what's the difference about "i can't believe"and "i don't believe"???

there has been & there have been & there was what difference about these? when i can use there has been? when i can use there have been and when i can use there was??

First notebook entry: Introducing myself •I am learning English, because I want to make friends from other counties. •My native language is Chinese, and I grew up in China. •I enjoy singing .