英语句子什么时候加be动词,什么时候不加
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举例如下:
I am watching TV. 现在进行时态
She was watching TV at 15:00 yesterday. 过去进行时态
By this time tomorrow,I will be shopping with my partner. 将来进行时态
A letter was received by her yesterday. 被动语态
I am a student. 我是一名学生
I want to be a scientist. 我想成为一名科学家。
I am talking with my sister. 我正在和我妹妹谈话。
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