初一英语句形转换谁给我讲讲啊!怎么用do does did 或be动词和助动词.

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初一英语句形转换谁给我讲讲啊!
怎么用do does did 或be动词和助动词.

首先要判断时态如:I go to Shanghai .一般现在时态,无be动词,主语非单三,故用do
She goes to Shanghai.一般现在时态,无be动词,主语单三,故用does
I went to Shanghai last week.一般过去时态,无be动词,故用did
She is in Shanghai.一般现在时态,有be动词is ,They are in Shanghai.一般现在时态,有be动词
are,
I'm In shanghai.一般现在时态,有be 动词am