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Nothing is difficult if you put your heart into it,_____

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Nothing is difficult if you put your heart into it,_____
A,is it Bisn,t it 怎么填,为什么
B
[1]如果陈述句部分的主语是不定代词nothing,something,everthing时,后反意部分主语用it,如:
Nothing is too easy in the world,is it?
[2]如果陈述句部分主语是不定代词everyone,nobody,somebody,someone时,后反意部分主语用they(当强 调全体时)或he (当强调个体时).如:
No one knows him,do they?
Someone is waiting for you,isn't he
[3]如果陈述部分主语是指示代词this,that,后用it;如果是指示代词these,those,则后用they.如:
This is a nice cap,isn't it?
These are boxes,aren't they?