用不用:Do you want to use it? Or are you using it? For example, if you want to use computer and you want to check whether other person is using. You can ask 你用不用这台电脑。But it’s a little rude so only can be used with friends and family. For stranger it’s better to use 你在用这台电脑吗?
用没用过/有没有用过:have you ever used it? 你有没有用过电脑?(have you ever used computer?)
**因为Bilibili(B站,一个视频网站)的缘故,视频制作者video maker经常被称作up主。
搜狗输入法有很多功能,甚至还可以当成钢琴演奏。😂