2.本课的语法要点是fishing, 它可以作主语或宾语,动词+ing作名词时称为动名词,它仍有动词的属性。Reading is an art. 读书是一种艺术。Climbing mountains is really fun. 爬山真有趣。
3.本课的语法要点是for+时间,I often fish for hours without catching anything. 我经常一连几个小时都钓不到鱼。for+时间,表示一段时间。for hours=for some hours 数小时。
4.本课的语法要点是after<conj.>+从句,after<prep.>+名词/动词的ing形式,在...之后(从句主语必须是主句的主语时两种形式可互换)。After I go to school, I learned a lot of knowledge.(用一般式表示一个事实,不用“went to”)。
5.After going to school, I learned a lot of knowledge.上学后,我学到了很多知识。介词after的宾语的动名词having spent所表示的动作发生在谓语动词go之前,所以用完成形式。