1.His friend,I think,are all kind to him.
2.This is girl coming from Beijing
3.He said he would come and saw me.
4.Heis kindly to his stepmother.
5.He said he would come and saw me.
6.It seemed that he has known everything at that time.
7.not only his brother but aslo his sister have been there.
8.I asked him go there ay once.
9.He can't come at this time.
10.He will come to see me in eath time he comes here.

1.His friend,I think,are all kind to him.
are->is 因为主语是单数friend。

2.This is girl coming from Beijing
girl前加定冠词 the， 因为后面有定语coming from Beijing。

3.He said he would come and saw me.
saw->see 因为 and 连接两个动词原形，是并列的两个谓语部分。

4.He is kindly to his stepmother.
kindly->kind 因为 kindly 是副词，不能作表语。


5.He said he would come and saw me.
同3。
6.It seemed that he has known everything at that time.
has->had 主句与从句的时态必须一致

7.not only his brother but aslo his sister have been there.
have->has 根据谓语动词就近一致的原则

8.I asked him go there ay once.
go前加to ，固定结构，ask sb. to do sth.

9.He can't come at this time.
去掉at. 有 this , that, next ，each等修饰时，不用介词。

10.He will come to see me in eath time he comes here.
去掉 in 。同9。

我本来不想做的，可出于职业的本能，我怕你被误导，还是做了。希望对你有帮助。