1) Had she seen him before ?
她以前见过他吗？
2) Have you seen her lately?
你最近见过她吗?
3) She once knew him.
她以前认识他。
4) Have you ever studied abroad?
你以前留过学吗？
5) I had not seen you formerly.
我以前没见过你。
6) I met him three years back.
我三年前见过他。
参考词条