虚拟语气中,什么情况下should可以省去

虚拟语气中,什么情况下should可以省去

虚拟语气在从句中用should的情况:
1.在建议、要求、命令、想法后的动词后的宾语从句里,用should + 动词原形,should 可以省略.如 advise,agree,command,decide,demand,determine,indicate,insist,order,propose,request,require,suggest,urge.
The doctor suggested that she (should) take good care of herself..
The author proposed that TV (should) be turned off at least one hour every day.
2.在建议,要求,命令,想法后的名词后的从句里,用should + 动词原形,should可以省略.如
advice,agreement,command,decision,demand,determination,indication,insistence,order,preference,proposal,request,requirement etc.
It was Bill’s suggestion that everyone (should) have a map.(主语从句)
His suggestion was that everyone (should) have a map.(表语从句)
He gave us a suggestion that everyone (should) have a map.(同位语从句)
3.在It is/was +形容词后that引起的主语从句中用should的结构,should 可以省略.这类形容词常见的有:advisable,anxious,compulsory,crucial,desirable,eager,essential,impossible,improper,important,natural,necessary,obligatory,possible,preferable,probable,recommended,urgent,vital; strange,surprising,unnatural,etc.
It's natural that she (should) do so.
It is essential that we (should) tell her the news.
It is important that we (should) learn English well.
还可用在下列含有被动语态的句型中：
It is/was suggested (requested,required,ordered,proposed,decided,…) that…
It is suggested that parents (should) spend more time with their children.
4.在 lest( 以免) 、for fear that ( 以免) 、in case (以防、以备) 、so that、in order that引起的表示目的的状语从句中用should(could/would)+动词原形,should 可以省略.
She walked quietly lest she (should) wake up her roommates.
Have your gun ready in case we should need it.
He left early in order that the children would not be alone in the house.