1.Our history teacher always begins his class by some questions.2.We were driving on our way to the cinema when the car broke up.3.By the time you finish this book , you have learned over 500 new words.4.Some of his childhood dreams have already been come true.5.We just can't wait going to the Great Wall of China with you.6.There are half of the students think that they should give some money to beggars.7.The small trees I planted ten years ago have been grown up .8.It's ten years since they got married with each other.9.How many times have you gone to Beijing?
參考答案:1.by改为with
2.up改为down
3.have learned前加will
4.去掉been
5.going改为togo
6.去掉There are
7.去掉been
8.with改为to
9.gone改为been
