1) Have you ever studied abroad?
你以前留过学吗？
2) Did you know English ?
你以前懂英文吗？
3) Will you stay the night?
你将留宿过夜吗？
4) Had she seen him before ?
她以前见过他吗？
5) I had not seen you formerly.
我以前没见过你。
6) Have you learned any Chinese?
你学过中文吗？
参考词条