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?
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/31 00:37:58
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