i don't know if Mr.Li.to the party.i think he will come if he ...freeAwill come;is Bwill come;will be

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i don't know if Mr.Li.to the party.i think he will come if he ...freeAwill come;is Bwill come;will be

i don't know if Mr.Li.to the party.i think he will come if he ...freeAwill come;is Bwill come;will be
i don't know if Mr.Li.to the party.i think he will come if he ...free
Awill come;is Bwill come;will be

i don't know if Mr.Li.to the party.i think he will come if he ...freeAwill come;is Bwill come;will be
A
句意是:我不知道李先生是否会来参加晚会.我想如果他有空他会来的.
第一个if 引导宾语从句,用一般将来时,第二个if 引导条件状语从句,主句用将来时,从句用一般现在时.

A
第一个IF ‘ 是否’ 引导宾语从句,根据句意动词还没发生,故用一般将来时; 第二个IF ‘ 如果’ 引导状语从句,遵循‘ 主将从现’ 原则‘ ,主句he will come 是一般将来时,故从句用一般现在时。

A.
will come将来时,if he is free 是对将来时的假设,用现在时

A 。if条件句里面用一般现在时。