高二书上有个句子：

I remember the whole thing as if it happened yesterday.

后面用as if it had happened yesterday 是不是好点？

因为书上还有个句子： Are you tired? You look as if you had had little sleep last night.

这实在不太好解释啊！望哪位老师解释一下。

教参上是这样说的：

（1）当as if 引导的方式状语从句中的谓语动词与主句的谓语动词在发生的时间上是同时的时，从句中的动词形式用过去式，系动词用were.

（2）当从句中的动词先于主句的动词发生时，从句的谓语动词用had done；

eg:He speaks English so fluently as if he had studied English in England.

就象这道高考题样:

Eliza remembers everything exactly as if it ______ yesterday.
A. was happening B. happens
C. has happened D. happened

给的答案是 D.

但是假如把选项修改一下：

Eliza remembers everything exactly as if it ______ yesterday.
A. was happening 　B. happens
C. had happened　D. happened

我认为应该还是用 had happened:

Eliza remembers everything exactly as if it had happened yesterday.

答：选B

考查：虚拟语气

解析： as if意为“好像，仿佛……似的”，所引导的从句如果表示真实情况，谓语动词用陈述语气。如果表示非真实情况，谓语动词用虚拟语气。因为Eliza所能想起的事都发生在过去，而不是发生在昨天，是非真实情况，所以要用虚拟语气。as if后的谓语动词应采用一般过去时的形式与状语yesterday搭配， 表示对现在真实情况的虚拟。*(beijing sizhong(