He must be playing computer games at home,isn't he,为何用isn't

He must be playing computer games at home,isn't he,为何用isn't he?
qiuxiepaoxie 1年前 已收到3个回答 举报

winelee 幼苗

共回答了21个问题采纳率:95.2% 举报

别因为看到must而用了mustn't(禁止)
因为这句的主干是“He is playing ."
而must只是表示肯定的判断,不影响主句意思.
所以用isn't he.
例:
You must know the truth,don't you?

1年前

5

Arakar 幼苗

共回答了6个问题 举报

如果must用于表示猜测的句子,去掉它,后面的动词根据主语的变化而变化,变成一般疑问句就可以了
He must be playing computer games at home变为
he is playing computer games at home,isn't he?

1年前

1

pjwbaby 幼苗

共回答了7个问题 举报

因为前面是BE动词啊,前肯后否,前否后肯。

1年前

0
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