动词的十六种时态表： 一般现在时 Do, does\ am,is,are 现在进行时 Am, is ,are + doing 现在完成时 Have\has + done 现在完成进行时 Have\has +being done 一般过去时 Did \w as, w ere 过去进行时 Was\w ere + doing 过去完成时 Had + done 过去完成进行时 Had been doing 一般将来时 Shall\w ill + do,be 将来进行时 Shall\w ill +be doing 将来完成时 Shall\w ill + have done 将来完成进行时 Shall\w ill+ have been doing 过去将来时 Should\w ould+ do 过去将来进行时 Should\w ould + be doing 过去将来完成时 Should\w ould+ have done 过去将来完成进行时 Should\w ould+ have been doing ★一般现在时 1、所有或任何时候都发生的动作或情况，即重复发生的动作。 --- How often does she visit her parents? --- Twice a month. 2、永恒的真理和客观事实。 1. Summer follows spring. 2. practice makes perfect. 熟能生巧。 3、①在条件或时间状语从句中，经常使用一般现在时代替一般将来时。 I’ll let you know as soon as he gets there. ②讨论计划和时间表或日程表时。 We leave at 11:15 and arrive at 17:50 tomorrow. 4、固定词组如 I see(明白)、I hear(听说)、I think(认为、想)、I feel(感觉)以引出已经了解的情况。 I see there is some trouble in London。 我知道伦敦方面有些麻烦。 ★一般过去时 1、过去已经完成的动作、结束的事情，或在过去重复发生的动作. When I was a child we always went to the seaside in August. 2、used to :表示过去的习惯，现在不存在。 I used to smoke, but I don’t any more. 3、用在it’s time, would rather, wish 后面的从句中 It’s time you went home. I wish I had a better memory. I’d rather you came tomorrow. 4、在从句中用来说明现在还存在着“过去”的情况 I’m sorry we left Paris. It was such a nice place. 5、could, might, would, should等“过去”的情态动词可用来指现在或者将来。 Could you help me for a moment ? 你能帮我一会吗？（用委婉的语气表将来） I think it might rain soon. 我人为可能很快就下雨。 Woul...
