Shall comes first in the verb phrase (after the subject and before another verb). We use it mostly with Iand we:
I shall post it to you tomorrow.
Shall cannot be used with another modal verb:
I shall have to be at the airport by 5 pm.
Not:
I shall must be… orI must shall be…
Shall can be followed by have to, need to and be able to:
We shall have to tell him what happened.
The good news is I shall be able to join you at your meeting next week.
The negative form of shall is shan’t. We don’t use don’t, doesn’t, didn’t with shall:
I shan’t be home tomorrow night.
We shan’t know the result of the tests till Tuesday.
We can use the full form shall not in formal contexts or when we want to emphasis something:
[a public notice in a restaurant]
The management shall not be responsible for damage to personal property.
We don’t often use the negative form.
The subject and shall change position to form questions.
Warning:
We don’t use do, does, did. The question form, with I and we, is the most common use of shall:
Shall I come round to the office?
Not:
Do I shall come round to the office?
We use shall in question tags:
I’ll phone you later, shall I?
We use shall I and shall we to make offers and suggestions, and to ask for advice.
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We use shall instead of will with I and we in rather formal contexts to make predictions and to talk about intentions or decisions. It is much less common than will.
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Warning:
We use shall only with the first person pronouns I and we to make predictions or express intentions:
The new business cards will be ready at the end of the month.
Not:
The new business cards shall be ready at the end of the month.
Warning:
In very formal contexts, we use shall to give commands:
[public notice]
This door shall be kept closed at all times.
We use should, not shall, for advice and suggestions:
In my opinion, we should book another hotel.
Not:
In my opinion, we shall book another hotel.
Should comes first in the verb phrase (after the subject and before another verb):
I should go home now.
Should cannot be used with another modal verb:
It should probably be sunny at that time of year.
Not:
It should may be sunny… orIt may should be sunny…
The negative form of should is shouldn’t. We don’t use don’t, doesn’t, didn’t with should:
There shouldn’t be many people at the beach today.
We use the full form should not in formal contexts or when we want to emphasis something:
We should not forget those who have given their lives in the defence of freedom.
The subject and should change position to form questions.
Warning:
We don’t use do, does, did:
Should I turn on the air conditioning?
Not:
Do I should I turn on the air conditioning?
Shouldn’t you be studying now?
We use should and shouldn’t in question tags:
I shouldn’t have told her that, should I?
They should be getting back on Sunday, shouldn’t they?
We use should most commonly to talk about what is the ideal or best thing to do in a situation:
There should be more public hospitals.
They should reduce the price of petrol. It’s so expensive.
There should be four more candles on the cake.
We use should have + -ed form to talk about things that were ideal in the past but which didn’t happen. It can express regret:
Everyone knows that this is a busy restaurant. They should have made a reservation.
I should have studied harder when I was young. I wish I had gone to college.
We often use should to give advice and make suggestions:
You should tell him what you think.
We should leave it until tomorrow; it’s late now.
We also use should to talk about what is likely to happen:
Shall we start? Luke’s delayed but he says he should be here in ten minutes.
There should be a very big crowd at the party. Mary has so many friends.
Warning:
We sometimes use should in hypothetical conditional clauses with if to express possibility. It is formal:
[information leaflet in a hotel room]
If you should wish to use the Internet, there is a code available at the reception desk.
If you should decide not to go on the trip, you will get a full refund.
Warning:
We can also use Should you as an alternative to If you should in these situations by changing the order of the subject and the verb. Compare these two sentences with the examples above. They have the same meaning and they are also formal:
Should you wish to use the Internet, there is a code available at the reception desk.
Should you decide not to go on the trip, you will get a full refund.
Spoken English:
In speaking, we often say you shouldn’t have when someone gives us a gift:
A:
I got you something from Texas. A cowboy hat.
B:
Oh Ken, you shouldn’t have!
We sometimes use should to express surprise or regret about something that happened:
I’m amazed that he should have done something so stupid.
I’m sorry that he should be so upset by what I said.
We use should as a more formal alternative to would with I and we in conditional clauses.
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We use should as a more formal alternative to would when we want to be less direct.
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Should and ought to have similar meanings and uses. Ought to is more formal and less common than should:
We should clean up the garden.
We ought to clean up the garden.
Should is much more common in negatives and questions than ought to:
Should we keep a seat for Margaret? (more common than Ought we to keep a seat …?)
He shouldn’t speak to his parents in that way. (more common than He oughtn’t/ought not to speak …)