宾语从句 1.He is happy when he is playing soccer.2.His mother fo

1.我一般觉得while后面加 be doing 形式
不过在你这种情况下when＋ be doing也行的
2.这是个省略句His mother found（that） he was playing computer games last evening
he was playing computer games last evening是that 引导的宾语从句,是一个独立的句子.he在这里做主语,所以不用him
例子：I think （that）he'll come.
3.楼上的说得很对.
he是三单,后面的动词要加s.
when he play soccer也是个宾语从句,但he play soccer是独立句子,任何情况下三单后面加S的规律是不变的.

恩 是对的
2中的he 是宾语从句中的主语所以不用宾格
For instance;She saw he was running in the playground.
3需要加S的，因为he是第三人称啊。

1.He is happy when he is playing soccer.
2.His mother found he was playing computer games last evening.
这句话对不对?
有点别扭，但严格说是对的
2 中的he 为什么不用变宾格?
这句话完整句子是
His mother found that...

第3句中的play当然要加s