请问am的过去时是was还是were?1.He was in San Francisco last year,but I (was)in New York.2.If I （were）,I would buy a house at the seaside.请看以上2句,为什么I后面有跟was,也有跟were?am的过去时到底是was还是were?

请问am的过去时是was还是were?1.He was in San Francisco last year,but I (was)in New York.2.If I （were）,I would buy a house at the seaside.请看以上2句,为什么I后面有跟was,也有跟were?am的过去时到底是was还是were?
请问am的过去时是was还是were?
1.He was in San Francisco last year,but I (was)in New York.
2.If I （were）,I would buy a house at the seaside.
请看以上2句,为什么I后面有跟was,也有跟were?am的过去时到底是was还是were?

请问am的过去时是was还是were?1.He was in San Francisco last year,but I (was)in New York.2.If I （were）,I would buy a house at the seaside.请看以上2句,为什么I后面有跟was,也有跟were?am的过去时到底是was还是were?
第二句是虚拟语气
虚拟语气中人称后都是were 这是规定
第一句就是单纯的一般过去时

am 的过去时是 "was"
在这里的were是虚拟语气的用法，表示假设。
p.s. 第二句少了的“you”吧，“if i were you”

两种情况，1句中的was单纯是am的过去式，而2句中的were是虚拟语气的用法！

是was。但虚拟语气会用were

am、is的过去式都是was
第二句是虚拟语气，因此am就变成了were

am的过去式是was,但这是if的从句，所以要用虚拟语气。