hadworked
本題考查if虛擬語氣中的用法.此題中有從句我已經(jīng)通過了考試（would have passed ）,表明從句是過去時,故對過去進行虛擬
全句話的意思就是我要是再努力一點,就通過考試了.由于此題中,主從句的主語都是一樣的,故用Had you worked
if虛擬語氣和if引導從句的一般將來式的區(qū)別如下
if引導條件狀語從句的時候,我們分為兩種情況,一種是真實的條件,一種是假設,叫作非真實條件狀語從句
當IF引導真實條件狀語從句,就要遵循我們所說的主將從現(xiàn)的原則,即主句用一般將來時,從句用一般現(xiàn)在時,比如 If all goes according to plan, the first concert will be Tuesday evening.這個就是真實的.
當IF引導非真實條件狀語從句時,就要用虛擬語氣表達.
1.if + 一般過去時,與現(xiàn)在事實相反,if i were a bird ,i would fly out of the school.
2. if + should/could/would +do,與將來事實相反,if i would finish the job tomorrow, i will call you.
3. if + had done ,與過去事實相反,if i had asked you how to do it ,i would not have made such a fool mistake.
怎么區(qū)別,就是看從句的時態(tài),在根據(jù)語境判斷.