10. Mr. Li is from Beijing .

　一个英语句子中不能有两个谓语动词..

9. He thought he spoke well.

　这个句子属于语法时态的不一致.

8. He had to ask the other one.

　“Have to do something” 是固定用法 ,不定式后用动词原形.

7. Several hours later, he was surprised.

　使用after时,不能放在时间表达语的后面.

6. I forget said this, our school wall beside has many trees.

　这个句子的表达和语法上都有问题. 如果单从中文意思来看,大家都明白他在说什么,但是要是让外教来批改,估计他会无尽的苦恼了.所以我们在不失句子原意的基础上,使用正确的语法.该句子的表达应该为:

　By the way, there are many flowers beside our school wall.

5. I usually swim there.

　-ing结尾的动名词不可以单独做句子的谓语.

4. I study there very happily.

　Study 是个动词,表示动作的程度要使用副词,不可以用形容词happy.

3. There are 100 books.

　表示某个地方有什么,一般使用There be 的存在句型.

2. Going into my school, you can see many flowers.

　这里使用动名词going做主语, go 这个动作由后面的you 发出.

1. I have computer class once a week.

　英语中表达频率次数时:一次 once, 两次 twice 从三次开始用 three times ...