1. if:
例：
If you do that again I'll hit you. （如果你再那么做，我就揍你?。?/span>
Do you think I'd be here if I had a choice?
（你覺得我要是有得選的話會(huì)呆在這里嗎？）
I have a drill. If you like, you can borrow
it. （我有鉆子，你要是想借，我可以借你。）
?
2. should: use this when something
might happen in the future but it is not likely
備注：''should''常用于正式的場(chǎng)合。用法：虛擬語氣"should sb done
sth"或"should
sth be done"或"should
there be sth"
例：
We've planned everything very carefully,
but should there be any problems, contact me immediately. （所有事情我們都安排好了，萬一還有問題，馬上跟我聯(lián)系。）
Should you need any help, you can always
phone me at the office. （如果你需要幫助，隨時(shí)可以打電話到我辦公室。）
?
3. had: use this when you are saying
what the result would have been if things had happened differently in the past
備注：''had''常用于正式的場(chǎng)合。用法：虛擬語氣"had sb done
sth"或" had
sth be done"或" had
there be sth"
例：
Had I known earlier that you wanted to join
the team, I'd have put your name on the list. （我要是早知道你想入隊(duì)，我早就把你名字寫上了。）
My horse would have won had he not fallen
at the final fence. （如果我的馬沒在最后一欄摔倒，它早贏了。）
?
4. in case: use this to say that
something is done because something else might happen or be true
例：
I'll take an umbrella in case it rains. （我?guī)О褌?，以防萬一下雨。）
In case you missed the first episode, here
is the story so far. （如果你之前沒看第一季，現(xiàn)在是前情提要。）
In case you were thinking I'd lend you any
money, I'll tell you now—I won't! （萬一你覺得我會(huì)借錢給你那就不好了，我現(xiàn)在明白地告訴你，我不會(huì)借給你?。?/span>
just in case
I'm sure they haven't forgotten but let's
send them a reminder just in case. （他們肯定不會(huì)忘記，但我們還是發(fā)個(gè)郵件給他們，提醒一下，以防萬一。）
?
5. in case of: used
especially in official notices and instructions to tell people what to do if
something unpleasant or unexpected happens
備注：''in case
of''常用于書面語中。
例：
In case of fire, leave the building by the
nearest exit. （如果發(fā)生火災(zāi)，從離你最近的逃生出口逃出去。）
It is illegal to park on the hard shoulder
except in case of emergency. （除非有緊急情況，否則把車停在硬質(zhì)路肩上是違法的。）
?
6. in the event of something: use
this when you are saying what will be done if at any time there is a serious
problem, an accident etc - used especially in official notices, plans, or
instructions
備注：''in the
event of something''常用于正式場(chǎng)合，也可寫作''in the event that something happens''。
例：
He left a letter for me to read in the
event of his death. （他留了一封信給我，讓我等他死后再拆閱。）
Britain agreed to support the US in the
event of war. （英國(guó)答應(yīng)若發(fā)生戰(zhàn)爭(zhēng)時(shí)就支持美國(guó)。）
The plan outlines emergency procedures in
the event of a major accident. （這個(gè)計(jì)劃草擬了發(fā)生嚴(yán)重事故時(shí)的一些急救程序。）
in the unlikely event of (=if something unlikely happens)
In the unlikely event of a burglar entering the building, the alarm system will be activated. （萬一樓里進(jìn)賊了，大樓的報(bào)警系統(tǒng)會(huì)發(fā)出警報(bào)。）
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