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They are always _______(complain) about too much homework

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They are always _______(complain) about too much homework
为什么要用complaining?
are 在这个句子中能不能去掉?然后complain
什么情况下be 动词能加always,often,usually之类的?
进行时和always连用时,带有感情色彩.只对某人,物一贯行为的感受,并非指一个正在进行的动作
如:
You are always speaking very fast.
你说话老是说得很快.(注意:在责备呢)
Your car is always breaking down.
你那破车老是出毛病