3 (in short answers and questions)
yes, I have 是 的 , 我 有 / 已 做 了
[shìde, wŏ yŏu/yĭzuò le]
no I haven't! 不 , 我 还 没 有 / 没 做 呢 !
so have I! 我 也 一 样 !
neither have I 我 也 没 有 过
"I've seen this movie before" - "oh have you?" " 我 以 前 看 过 这 部 电 影 " " 噢 , 是 吗 ? "
"we haven't been there before" - "oh haven't you?" " 我 们 以 前 没 去 过 那 儿 " " 噢 , 是 吗 ? "
I've finished, have you? 我 已 经 完 成 了 , 你 呢 ?