Modal verb: Should

Should

Should is an auxiliary verb, a modal auxiliary verb. We use should mainly to:

• give advice or make recommendations
• talk about obligation
• talk about probability and expectation
• express the conditional mood
• replace a subjunctive structure

Structure of Should

subject + should + main verb

The main verb is always the bare infinitive (infinitive without "to").

	subject	auxiliary verb	main verb
+	He	should	go.
-	He	should not	go.
		shouldn't
?	Should	he	go?

Notice that:

• Should is invariable. There is only one form of should.
• The main verb is always the bare infinitive.

The main verb is always the bare infinitive. We cannot say:
He should to go.

 

There is no short form for should. The negative should not can be shortened to shouldn't.

Use of Should

should: Giving advice, opinions

We often use should when offering advice or opinions (similar to ought to):

• You should see the new James Bond movie. It's great!
• You should try to lose weight.
• John should get a haircut.
• He shouldn't smoke. And he should stop drinking too.
• What should I wear?
• They should make that illegal.
• There should be a law against that.
• People should worry more about global warming.

People often say "They should..." Usually, the "they" is anonymous and means the government, or the company, or somebody else - but not us!

should: Obligation, duty, correctness

Another use of should (also similar to ought to) is to indicate a kind of obligation, duty or correctness, often when criticizing another person:

• You should be wearing your seat belt. (obligation)
• I should be at work now. (duty)
• You shouldn't have said that to her. (correctness)
• He should have been more careful.
• Should you be driving so fast?

should: Probability, expectation

We use should to indicate that we think something is probable (we expect it to happen):

• Are you ready? The train should be here soon.
• $10 is enough. It shouldn't cost more than that.
• Let's call Mary. She should have finished work by now.

should: Conditionals

We sometimes use should (instead of would) for the first person singular (I) and first person plural (we) of some conditionals:

• If I lost my job I should have no money.
  (If he lost his job he would have no money.)
• We should be grateful if you could send us your latest catalogue.

This is not a very important distinction. (More about the use of shall/will and should/would.)

should: (If I were you I should...)

We often use the conditional structure "If I were you I should..." to give advice.

• If I were you, I should complain to the manager.
• If I were you I shouldn't worry about it.
• I shouldn't say anything if I were you.

Note that we can omit "If I were you..." and just say:

• I should complain to the manager.
• I shouldn't worry about it.
• I shouldn't say anything.

In these cases, the phrase "I should" really means something like "you should".

should: Pseudo subjunctive

We often use a special verb form called the subjunctive when talking about events that somebody wants to happen, hopes will happen or imagines happening, for example:

• The president insists that the prime minister attend the meeting.

However, this is much more common in American English. British English speakers would probably convey the same idea using should:

• The president insists that the prime minister should attend the meeting.

Here are some more examples:

Subjunctive typically American English	Using should typically British English
The president is insisting that pollution be reduced.	The president is insisting that pollution should be reduced.
The manager recommended that Mary join the company.	The manager recommended that Mary should join the company.
It is essential that we decide today.	It is essential that we should decide today.
It was necessary that everyone arrive on time.	It was necessary that everyone should arrive on time.

should: Why should..? | How should..?

If we don't understand (or agree with) something, we may use "Why should..?":

• Why should it be illegal to commit suicide? It's your life.

"Why should..?" and "How should..?" can also indicate anger or irritation:

• "Help me with this." | "Why should I?"
• "Where are my keys?" | "How should I know?"

From: EnglishClub.com