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问一个英语歌里的句子就是方大同有一首歌 《nothing's gonna change my love for you》

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问一个英语歌里的句子
就是方大同有一首歌 《nothing's gonna change my love for you》
里面有一句"I will be there for you if you should need me."
请问此处为什么要用 should
去掉可以吗?
还有,在什么情况下用should?
should 在此表示可能,比较委婉吧.
去了语法上没问题,只是意思有点小差别.
should
[Fed,FJd]
v.aux.
否定式缩略为 shouldn't
(用于间接引语,表示)将
We said we shouldn't arrive till 6.
我们说过我们六点才能到.
"If it should rain tomorrow,the sports meeting would be postponed."
"要是明天下雨,比赛就延期举行."
(和that一起用于表示意愿的动词和形容词之后)
He was keen that she should go to college.
他渴望她能上大学.
(在条件句中与第一人称连用) 可能;会
I should have bought it if I had enough money.
如果当时我有足够的钱,我会把它买下来的.
(表示责任或义务)必须,应该
Children should obey their parents.
儿童应该服从他们的父母.
He should have known that the police would never allow this sort of thing.
他本应知道这样的事情警察是决不允许的.
(表示可能之事)可 能
It should be fine tomorrow.
明天可能天晴.
(表示不确定)万一
If I should see him,I'll tell him.
万一我见到他,我就告诉他.