初中英语语法大全辅导之动词ing和带to不定式作主语

　　【—辅导之动词ing和带to不定式作主语】下面是对动词ing和带to不定式作主语语法的讲解，同学们认真学习。

　　动词ing和带to不定式作主语：

　　To be a teacher is my dream. Working hard brings you success.

　　Taking care of our environment is very important. To plant trees makes me happy.

　　Reading books gives you knowledge. (以上各句谓语都用单数，见黑体部分)

　　Listening and writing are both difficult. (此句主语因指两件事，谓语用复数)

　　18.later / after / ago / before: 1later“…时间后”结构：时间段+later

　　常用于一般过去时。They went to Beijing five days later.

　　(later前无时间段，单独在句尾，常用于将来时：I’ll see you later.)

　　2after“…时间后”结构：after+时间段，常用于一般过去时，和1相同。

　　They went to Beijing after five days. The dog died after a week.

　　(after也可加句子, 但主句不一定用一般过去时：I’ll send you an e-mail after I get home.

　　Return it to me after you finish it. 见2.)

　　3ago“…时间前”结构：时间段+ago, 用于一般过去时。

　　The Greens moved to Shanghai 初中数学 four weeks ago. I saw it ten minutes ago.

　　(若有since+时间段+ago，常用现在完成时：Mr. Li has worked here since 5 years ago.)

　　4before 单独放在句尾，常用现在完成时：“以前”

　　I have been to London before. He has seen the film before.

　　(若是时间段+before,常用过去完成时，“…前”： I had seen the film two weeks before. We had found out the answer to the problem an hour before.)

　　希望以上对动词ing和带to不定式作主语语法的讲解，能很好的帮助同学们对的掌握，希望同学们在考试中取得好成绩。

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