推荐回答（4个）
1.去掉have。 后面有明显的过去时间状语yesterday evening，只能用一般过去时。 如果是before yesterday evening，用过去完成时。
2.happen变成happening.see sb doing sth 是强调这件事发生的过程。
3.how many 改成what. 固定用法
4.of 改成 for
5.fourty改成forty
6.are they 改成 they are
1、have变had
2、happen变happenning
3、How many变How large
4、of变for
5、Fourty变Forty
6、are they变they are
1 我昨晚读完了这本书。
2 一位女士路过的时候目睹了它发生。
3 中国人口有多少？
4 我认为他去上学没问题了。
5 有四十栋房子靠近这条河。
6 他们学习是多么的努力啊！
1,have---had
2,happen---happening
3,many---much
4,to---for
5,fourty---forty
6,are they---they are
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