If my grandmother fell downstairs and wasn't moving,I'd……为什么是wasn't,而不是weren't?为什么是要用“be doing"的这种形式,而不是”couldn't move"

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Ifmygrandmotherfelldownstairsandwasn''tmoving,I''d……为什么是wasn''t,而不是weren''t?为什么是要用“bedoing"的这种形式,而不是”cou

If my grandmother fell downstairs and wasn't moving,I'd……为什么是wasn't,而不是weren't?为什么是要用“be doing"的这种形式,而不是”couldn't move"
If my grandmother fell downstairs and wasn't moving,I'd……
为什么是wasn't,而不是weren't?
为什么是要用“be doing"的这种形式,而不是”couldn't move"

If my grandmother fell downstairs and wasn't moving,I'd……为什么是wasn't,而不是weren't?为什么是要用“be doing"的这种形式,而不是”couldn't move"
grandmother是单数所以用was
wasn't moving 是用进行时表示将来 因为 move 是短暂性动词
比如 :我就来 I‘m coming
if 引导的条件状语从句用一般现在时或一般过去时表示将来
明白了吗?

my grandmother是第三人称,所以用wasn't.
wasn't moving强调摔下楼动不了的状态,couldn't move强调动作。

grandmother是单数,所以用was,第二个问不太清楚。