为什么用sleeping而不用slept
How long did you ____(sleep) last night?为什么用sleep不用slept?
While he was going shopping,I slept还是was sleeping,为什么?
you can take a sleeping train for an extra charge这里为什么用for不用
don't talk so loudly.your father( )后为什么填slept不填is sleeping呢不
现在分词修饰名词与过去分词修饰名词的区别.例如 sleeping bags (睡袋)为什么不是 slept bags;
She asks me if I slept well the day before.为什么要用slept?
I am sleeping为什么结尾不直接用SLEEP而要加ING那?
Where did you sleep last night 请问这句sleep为什么不用过去式slept
请问sleeping和slept和sleep如何用?需要句子..
为什么炼铁用co而不用c?
为什么用if而不用because
英语翻译为什么不用early,而用earlier