my sister is looking at a picture 为什么不是my sisiter is looking a picture 有什么区别?

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my sister is looking at a picture 为什么不是my sisiter is looking a picture 有什么区别?

my sister is looking at a picture 为什么不是my sisiter is looking a picture 有什么区别?
my sister is looking at a picture 为什么不是my sisiter is looking a picture 有什么区别?

my sister is looking at a picture 为什么不是my sisiter is looking a picture 有什么区别?
因为LOOK 是不及物动词,后接宾语时要加介词,故只有My sister is looking at a picture
没有my sisiter is looking a picture 这种说法

持续时间不同么

look at 是词组,一定要放在一起用

my sisiter is looking a picture 是错误的,因为look是不及物动词,后面必须有介词at后才可以接宾语a picture.

my sister is looking at a picture 我妹妹正在寻找图片( look at 寻找)
my sisiter is looking a picture 我妹妹看图片 ( look 看)