Question

1.What would we use to look at ourselves when comb our hair if we _(don't have /hadn't had/didn'

1.What would we use to look at ourselves when comb our hair if we _(don't have /hadn't had/didn't have)mirrors？
2.If you gave me a hand looking for my book,that_(is/was/would be)a big help.
3.I'd keep my wallet in the same place every day if I _(amwerecan be)you.That way I'd always know where it is.要详细解释我知道答案，却不知道为什么这样做1.didn't have 2.would have 3.were

Answer 1

这里都是虚拟语气的语法点

1. 如果没有镜子，梳头的时候我们要照什么？ 显然是对现状事实的一个虚拟，所以条件从句用一般过去时表示对现在的虚拟假设，三个选项中，只有didn't have是一般过去时。

2. 如果你能帮我找书那就是帮我大忙了。这里的话也是用了虚拟语气（虽然这里不是严格地所谓与事实相反的情形，但有时虚拟语气可以表示一种请求），从句用了一般过去时，主句要用过去将来时，就像第一句也用了would一样。

3. if I were you显然只有这个才是虚拟

Answer 2

cNever a negative acknowledge why it is impossible.