این ساختار رسمی و ادبی هست و بجای if استفاده میشه. با استفاده از فرمول جابجاسازی (وارونگی inversion) جمله بصورت شرطی تبدیل میشه.
Should you (Should with inversion)
Example 1
* Should you wish to cancel your order, please contact our customer service department on 02317 6658932.
( or If you should wish to cancel your order …)
Example 2
* Should your child become anxious or nervous about any activity, it is a good idea to inform the team-leader.
(or If your child should become …)
Example 2
* Should you have an extra game to throw away, I get them.
If you have an extra game to throw away, I get them.
had هم درست با همین فرمول ساخته میشه و رسمیه. ولی با should قاطی نباید بشه. این واژه برای حالت سوم شرطی (حالت فرضی که در گذشته اتفاق نــــیوفتاده و نتیجه شو بحث میکنید) میباشد.
Had you (Had with inversion)
Example 1
* Had I known you were waiting outside, I would have invited you to come in.
(If I had known you were waiting outside …)
Example 2
Had Margaret realized she would be traveling alone, she would never have agreed to go.
Example 3
* Had she studied, , she would have passed the exam.
* If she had studied, she would have passed the exam
این کلمات هم رسمی هستن و برای ساختن جملات شرطی استفاده میشن
unless
As long as
so long as
only if
on condition that
providing (that)
provided (that)