为您找到"
I+have+not+seen+that+firm+yet是现在完成时吗?
"相关结果约100,000,000个
I+have+not+seen+that+firm+yet是现在完成时吗？判断一个句子是不是现在完成时，只需要找到句子中有否助动词have或者has，然后去找动词的过去分词，如果能找到，即可肯定是现在完成时。很明显本句中有 have, 而seen .
Haven't I seen you before? 我以前见过你吧? He has known both grief and happiness.悲伤和欢乐的滋味他都尝过。 We have not been to the cinema recently.我们最近没有去过电影院。 I have not seen that film yet.我还没有看过那部电影。
在与完成时连用时，很多人经常把这三者混淆起来。虽然 already，just 和 yet 都可以与完成时连用且意思比较接近，但是它们还是有很大的区别，特别是在句中的位置和事情发生的时间长短等。 一、already 用来强调某…
现在完成进行时 have been doing sth （到现在）一直在做某事 They have been talking for 4 hours. We have been waiting here for 30 minutes. 【提示】表达抽象概念的动词，不能用在现在完成进行时中，但可以用在普通现在完成时中。 I have been having this car for a year.
They haven't talked yet. 他们还没有说话。 She hasn't submitted her report yet. 她还没有提交报告。 我们在肯定句中使用 already 来表示某事发生在现在之前（通常，比我们预期的要早）。 We've already had dinner. 我们已经吃过晚饭了。 They have already gone out. 他们已经出去了。
I have never seen the film before. 以前我从未看过那部电影。 现在完成时的第一种用法常与以上的副词连用，因此这些词有时可以作为现在完成时的标志词。
I have seen her for two years.(×) I haven't seen her for two years.(√)我已经两年没见过她了。 ★瞬时性动词用现在完成时，若句子中需要用表示一段时间的状语，通常把瞬时性动词转换成与之对应的持续性动词。 How long have you bought the car?(×) How long have you had the car?(√)这辆车 ...
We have not been to the cinema recently.我们最近没有去过电影院。 I have not seen that film yet.我还没有看过那部电影。 Her husband died ten years ago，but she has since remarried.她丈夫10年前去世，她后来又嫁人了。
I have been to Tokyo already. yet 「yet」用于否定句和问句，一般会放在句尾；意指在过去和现在的一段时间内曾经有（或从未），直到现在曾有（或未曾），以及包括现在有（或没有）。
*Correction** 1. I have already seen that film = You saw the film (past tense). and 2. I haven't seen that film yet = You did not see the film (but "yet" denotes that you probably will eventually see it).