我整理的高中英语语法大全
16. 一般现在时代替一般过去时
1 ） "书上说"，"报纸上说"等。例如：
The newspaper says that it's going to be cold tomorrow. 报纸上说明天会很冷的。
2） 叙述往事，使其生动。例如：
Napoleon's army now advances and the great battle begins.拿破仑的军队正在
向前挺进，大战开始了
17. 一般现在时代替现在完成时
1） 有些动词用一般现在时代替完成时，如hear, tell, learn, write , understand, forget, know, find , say, remember等。例如：
I hear （= have heard） he will go to London. 我听说了他将去伦敦。
I forget （=have forgotten） how old he is. 我忘了他多大了。
2） 用句型 " It is since "代替"It has been since "。例如：
It is （= has been） five years since we last met. 从我们上次见面以来，五年
过去了。
18. 一般现在时代替现在进行时。
在Here comes /There goes 等句型里，用一般现在时代替现在进行时。例如：
There goes the bell. 铃响了。
19. 现在进行时代替将来时
1） 表示即将发生的或预定中计划好的活动。例如：
Are you staying with us this weekend? 和我们一起度周末好吗?
We are leaving soon. 我们马上就走。
2） 渐变动词，如get, run, grow, become, begin以及瞬间动词die等。例如：
He is dying. 他要死了。
20.时态一致
1） 如果从句所叙述的为真理或相对不变的事实，则用现在时。例如：
At that time, people did not know that the earth moves. 那时，人们不知道地球是动的。
He told me last week that he is eighteen. 上星期他告诉我他十八岁了。
2） 宾语从句中的，助动词ought, need, must, dare 的时态是不变的。例如：
He thought that I need not tell you the truth. 他认为我不必告诉你真相。
三.巩固练习:
1、I’ ll give the book to him as soon as he ________ back.
2、Has the baby ________ crying yet? (stop)
3、I don’ t know whether Mother __________ me to Beijing next month.(take)
4、She _______ on her coat and went out. (put)
5、 “What are they doing?” “They __________ ready for the sports meeting.” (get)
6、The boy asked his mother ________him go and play basketball.(let)
7、I’m sorry to keep you ____________ for a long time. (wait)
8、It ________ (take) him half an hour _______ (finish) his homework yesterday.