图片很多，建议大家收藏保存之后慢慢观看，尤其是每种时态都是怎么构成的，也非常重要，还有动词过去的变化，英语第三人称单数的变化，这个我在以前的文章中都可以，大家可以看下面的链接，很多人在做题的时候这种时态那种时态总是傻傻的分不清楚，主要原因就是我们用的太少，，也练习得太少，考试写作文的时候你写一个句子的时候语法结构是支撑，就是你要先选择好用什么时态，然后再去加你的短语或者单词。
最后给大家出三道时态的习题，大家可以把答案写在评论区，大家一起讨论。
1. —I called you at 4:00 yesterday afternoon, but no one answered.
—Sorry, I _____ with my friends at that time.
A. swim B. swam C. will swim D, was swimming
2 .I will tell him as soon as he _____ back
A. come B. comes C. will come D. came
3 – I don’t know if Mr. Li ____ to the party this evening.
-- I think he will come if he ____ free.
A. will come; is B. will come; will be C. comes; is D. comes; will be
