Odie的英语课 945 Grammar | Present perfect tense 1

现在完成时 the present perfect tense perfect 完成时的I went to London in 2020.I have been to London.第一句是一般过去时（the past simple tense），在过去的某个时间点，已经完成某个事情、某个动作。一般过去时通常会有时间词，如 in 2020 或 last year 等等。I went to London in 2020. 我2020年去了伦敦。这句话的重点是，这件事发生在2020年，过去的这个时间点。第二句是现在完成时（the present perfect），过去某个时间做的事情、动作，但它和现在是有联系的，它的影响、它的作用持续到现在。I have been to London. 我去过伦敦。这句话的重点是，去过伦敦这是我的一个经历，我曾经做过这个事，到现在还记得去伦敦的经历。它是什么时候发生的并不是重点。现在完成时的形式have/has + 动词的过去分词肯定形式I have worked. (I've worked.) 我工作过。You have worked (You've worked.)He / She / It has worked. (He's / She's / It's worked.)We have worked. (We've worked.)They have worked. (They've worked.)否定形式I have not worked. (I haven't worked.) 我没有工作过。You have not worked. (You haven't worked.)He / She / It has not worked. (He / She / It hasn't worked.)We have not worked. (We haven't worked.)They have not worked. (They haven't worked.)疑问形式Have I worked? 我工作过的吗？Have you worked?Has he / she / it worked?Have we worked?Have they worked?简短回答Yes I have. / No I haven't.Yes you have. / No you haven't.Yes he/she/it has. / No he/she/it hasn't.Yes we have. / No we haven't.Yes they have. / No they haven't.