Mary weights 45 kilograms now.(划线部分weights 45 kilograms)为什么用how much ,那如果how many什么情况下用

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Mary weights 45 kilograms now.(划线部分weights 45 kilograms)为什么用how much ,那如果how many
什么情况下用

问句是:How much does Mary weigh ?
意思是:玛丽重多少?

How much 后面跟不可数名词,或者不跟 名词.
How many 后面必须跟可数名词复数形式.

例如:
How much do you like watching TV? (how much 后面不跟名词)
How much water do you have in the bottle ?你瓶子里有多少水?(how much +不可数名词)
How many students are there in your school?你们学校有多少学生?


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