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

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

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

And是并列 am with可以理解为真正一起 with是prep

I am with my sister我与我我妹妹在一起
I and my sister我和我的妹妹

and 是连词。
i and my sister 这也是个短语而已
i am with my sister 是个句子。
with 是介词

I 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

be with sb.和某人在一起。I don't want to be with him.
I and my sister,是我和姐姐的意思。。

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