英语题：把下列句子连成宾语从句的复合句

I can't remember whether I have seen him before
He doesn't know whether he need to come early
I believed that we would become good friends
He asks how we can protect the environment
宾语从句是主从复合句的一种 主句也就是 这4句话中的I can't remember He doesn't know I believed He asks 而从句就是主句的补充 它从属于主句 不能独立 从句就是4句话中的 whether I have seen him before
whether he need to come early
that we would become good friends
how we can protect the environment

1.I can't remember whether I have seen him before
2.He doesn't know why he needs to come early
3.I belived that we will become good friends.
4.He asks how we can protelt the environment

参考：http://zhidao.baidu.com/question/12210818.html

1.I can't remember whether I have seen him before. 2.He doesn't know whether he need to come early. 3.I believed that we would become good friends. 4.He asked how we can protect the enviroment. 宾语从句的复合句就是主句再加上从句，称为宾语从句的复合句。 宾语从句是在句中起宾语作用的句子。

i can't remember whether i have seen his before.
he doesn't know whether he needs to come early.
i belived that we would become good friends.
He asks how they can protect the enviroment.