should

modal verb
A1
OPAL
1
A1
used to show what is right, appropriate, etc., especially when criticizing somebody’s actions
باید, شایسته است, مناسب است, می‌بایست
2
A2
used for giving or asking for advice
بهتر است, شایسته است, صلاح است
You should stop worrying about it.
Should I call him and apologize?
I should wait a little longer, if I were you.
(ironic)‘She doesn't think she'll get a job.’ ‘She should worry, with all her qualifications .’
3
B1
used to say that you expect something is true or will happen
باید, احتمالا
We should arrive before dark.
I should have finished the book by Friday.
The roads should be less crowded today.
4
B2
used to say that something that was expected has not happened
باید, می‌بایست, بایستی
It should be snowing now, according to the weather forecast.
The bus should have arrived ten minutes ago.
5
B2
used as the past form of shall when reporting what somebody has said
می‌بایست, می‌شایست, بایست
He asked me what time he should come.
(British English, formal)I said (that) I should be glad to help.
6
B2
used after that when something is suggested or arranged
باید, شایسته است که, ضروری است که, لازم است, پیشنهاد می‌شود که
She recommended that I should take some time off.
In order that training should be effective it must be planned systematically.
7
B2
used with I and we to give opinions that you are not certain about
شاید, احتمالاً, ممکن است
I should imagine it will take about three hours.
‘Is this enough food for everyone?’ ‘I should think so.’
‘Will it matter?’ ‘I shouldn't think so.’
8
used for expressing strong agreement
باید, بایستی, می‌بایست, بایست
‘I know it's expensive but it will last for years.’ ‘I should hope so too!
‘Nobody will oppose it.’ ‘I should think not!
9
used to refuse something or to show that you are annoyed at a request; used to express surprise about an event or a situation
باید, می‌بایست
Why should I help him? He's never done anything for me.
How should I know where you've left your bag?
I got on the bus and who should be sitting in front of me but Tony!
10
used to tell somebody that something would surprise them or make them laugh if they saw or experienced it
اگر کسی می‌دید, اگر کسی می‌شنید
You should have seen her face when she found out!
11
used after that after many adjectives that describe feelings
باید, لازم است, ضروری است, بایسته است, سزاوار است, می‌بایست
I'm anxious that we should allow plenty of time.
I find it astonishing that he should be so rude to you.
12
used with I and we in polite requests
باید, می‌باید
I should like to call my lawyer.
We should be grateful for your help.
13
used after I or we instead of would for describing what you would do if something else happened first
می‌بایست
If I were asked to work on Sundays, I should resign.
14
used to refer to a possible event or situation
گمان است, احتمالاً
If you should change your mind, do let me know.
In case you should need any help, here's my number.
Should anyone call , please tell them I'm busy.