He said he would help me with my maths if he --- free. A. was B. will be C. would be D. is 该选什么

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He said he would help me with my maths if he --- free. A. was B. will be C. would be D. is 该选什么

He said he would help me with my maths if he --- free. A. was B. will be C. would be D. is 该选什么
He said he would help me with my maths if he --- free. A. was B. will be C. would be D. is 该选什么

He said he would help me with my maths if he --- free. A. was B. will be C. would be D. is 该选什么
A.
从句子结构上看:said后面省略了that,动词后有连接词的是宾语从句,而这个从句部分又是个条件状语从句.
条件状语从句中有个原则:if作“如果”的意思时,主句用将来时,从句用一般现在时.简单记就是“主将从现”.
宾语从句有个原则:时态一致,即如果主句用过去的时态,从句里的谓语动词都用过去的时态;如果主句是现在或者将来的时态,从句的时态按语境来定.
故此题选A.
P.S.在虚拟语气中,无论和什么人称连用,be动词的形式都是were.此题并非虚拟语气.

A. was

一般过去时条件句也使用一般过去时

他说他如果有空会在我的数学上帮助我

虚拟语气应该不是这样用的。 虚拟语气的条件句是:if he were free

A. 一般虚拟语气用were或(should)be

A 答案的Was是is过去式表虚拟语气。任何虚拟假设要用到be动词时都要用were或者was来代替are和is

选择a虚拟语气,前面用将来的虚拟即would 后面就用过去时即was