手機使用者d174f 2011-11-05

I am listening to the music while I am doing my homework。

when 後面用瞬間動詞（時態不確定）

while後面用延續性動詞ING形式（時態不確定）

兒子高考了 2011-11-05

When Iam doing my homework，I am listening to music

tongtongziji 2011-11-05

I am listening to music when i am doing homework

匿名使用者 2011-11-05

when後用過去時吧