I am with my sister

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/06/28 15:53:07

I am with my sister
为什么加am
I and my sister怎么不加

这是一个固定搭配,be with sb,be可以是was were am is are等等,牵扯了时态问题
而第二个句子用and连接,这个句子不牵扯时态问题,用在什么场合,什么时间都行
am with my sister 是一句话：我和我的妹妹在一起
I and my sister 是一个并列短语：我和我的妹妹
后者不是一句话,一句话里是要有动词作谓语的,am是系动词

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