1) How long have you known her?
你认识她多久了？
2) She mentioned that she knew you.
她说过她认识你。
3) She certainly knows you.
她确实认识你。
4) How long did she stay ?
她逗留了多久？
5) And you've been In here how long?
你在这边多久了？
6) How long do you stay?
你逗留了多久？
参考词条