问题描述：
在英文句子中,什么时候要加be动词,什么时候不用?
例：“she calmed the baby by giving him some milk”和“he was calm when i told him the bad news”中第一个要有be动词,而第二个不用?
例：“she calmed the baby by giving him some milk”和“he was calm when i told him the bad news”中第一个要有be动词,而第二个不用?
问题解答：
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