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"

this is my grandmother my grandmother作文 my grandmother是什么意思 Ivisited my grandmother. I will visit my grandmother if she ｛ ｝ free tomorrowA isB is notCwill isDwill not My grandmother often has a c_____ with the old lady if they are free. My grandmother often has ac--- with the old lady if they are free. She's my grandmother(对my grandmother特殊疑问句) The Grandmother of my children If my grandmother fell downstairs and wasn't moving,I'd hurry to call the hospital first怎样翻译 My grandmother is old,but your grandmother is older. on my way to my grandmother's my cousin's grandmother is my ____ My grandfather and grandmother are my g() 初三英语书上READING的一个问题原句：If my grandmother fell downstairs and wasn't moving,I'd hurry to call the hospital first.我觉得grandmother是单三,所以fell应加s,请不吝赐教 同义句： I visited my grandmother yesterday.I visited my grandmother yesterday.I ____ ____ ____ my grandmother yesterday. This is my grandmother.改为否定句 That is my grandmother.怎么变复数