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. 9、If it ________ an interesting film, we’ll see it tomorrow. (be) 10、They usually ________ (do) their homework after supper. 11、Listen! Who _____________(sing) in the next room now? 12、__________(be) your parents in Shanghai last year? 13、Mr. Yu _____________(teach) us maths since 1982. 14、They will have a trip to the Great Wall if it _________ (not rain) tomorrow. 15、Li Ming often _________ (listen) to the radio in the morning. 16、A: “Father, may I go out and play football?”
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