while 后面必須借動詞的ing形式嗎?
She listened to her favourite rock music while singing along with the words.
She was putting on her jeans while asking me to hand her the sweater.
He banged on the door while opeaning it.
In the bathroom she put on some makeup while loojing in the mirror.
The school master looked angrily at the naughty student while talking with his parents
看了很多例句都是這樣,為什么必須加V-ing?而when后面為什么可以加動詞原形呢》
when 后面加非延續(xù)性動詞，為什么就是正常的過去時？
while 后面加延續(xù)性動詞為什么就是ing形式？