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lf she (nodded) it means that she agrees with our plan 为什么要用

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lf she (nodded) it means that she agrees with our plan 为什么要用nodded     if的用法是什么呢 不是有主将从先的吗 为什么这里不用了
l asked him if he would help me and he ( )            以及Alice smiled to show her ( ) with my suggestion 这两个空哪个填 agreement 哪个填nod (用适当的形式填空)
lf she (nodded) it means that she agrees with our plan 为什么要用
if的用法是在这里引导条件状语从句.主将从现,表示主句是一般将来时的时候,条件状语从句和时间状语从句要用一把现在时态代替将来时态.而本句主句不是一般将来时.means是一般现在时.不符合“主将从现”的要求.所以,这里不用一般现在时.本句用一般过去时,说明nod是过去发生的.
l asked him if he would help me and he (nodded ).Alice smiled to show her (agreement ) with my suggestion
再问: 本句的主句是it后面的句子吗
再答: 是的。