The modal verb should is one of the most useful words in English. Whether you're giving advice, expressing expectations, or making polite suggestions, should helps you communicate with nuance and tact. This guide covers all the ways to use should correctly.
Quick Overview: Uses of Should
| Use | Example | Meaning |
|---|---|---|
| Advice | You should see a doctor. | I recommend this |
| Obligation | You should apologize. | It's the right thing to do |
| Expectation | She should be here soon. | I expect this to happen |
| Probability | That should be enough. | It's likely/probable |
| Criticism (past) | You should have told me. | But you didn't (regret) |
Structure and Forms
| Form | Structure | Example |
|---|---|---|
| Positive | subject + should + base verb | You should try this. |
| Negative | subject + should not/shouldn't + base verb | You shouldn't worry. |
| Question | Should + subject + base verb? | Should I call him? |
| Past (perfect) | subject + should have + past participle | I should have studied. |
| Passive | subject + should be + past participle | This should be done today. |
Use 1: Giving Advice and Recommendations
The most common use of should is to give advice or make recommendations:
You should eat more vegetables.
She should apply for that job.
We should leave early to avoid traffic.
You shouldn't stay up so late.
Asking for Advice
| Question | Situation |
|---|---|
| Should I tell her the truth? | Asking for advice about a decision |
| What should I do? | General request for advice |
| Where should we go for dinner? | Asking for a recommendation |
| Do you think I should accept the offer? | Seeking opinion on a choice |
Use 2: Expressing Obligation (Soft)
Should expresses a moral obligation or duty—what is right or expected. It's softer than must or have to:
| Should (soft) | Must/Have to (strong) | Difference |
|---|---|---|
| You should be polite. | You must be polite. | Should = recommended Must = required |
| You should help them. | You have to help them. | Should = it's right Have to = it's mandatory |
| We should respect elders. | We must respect elders. | Should = expected Must = obligatory |
Moral obligations:
People should treat others with respect.
We should help those in need.
Children should listen to their parents.
You shouldn't lie to your friends.
Use 3: Expectations and Predictions
Should expresses what we expect to happen based on logic, plans, or normal circumstances:
The train should arrive at 6 PM. (according to the schedule)
She should be home by now. (I expect she is)
This should be easy. (I expect it will be)
The package should arrive tomorrow. (tracking says so)
| Expectation with Should | What It Means |
|---|---|
| It should be sunny tomorrow. | The forecast predicts sun |
| He should know the answer. | He probably knows (he's an expert) |
| There should be enough food. | I think there's enough |
| The meeting shouldn't take long. | I expect it to be short |
Use 4: Should Have + Past Participle
Use should have + past participle to talk about the past—things that didn't happen but would have been better:
Expressing Regret
I should have studied harder. (but I didn't → regret)
We should have left earlier. (but we didn't → we were late)
You should have told me. (but you didn't → I'm upset)
She should have listened to the advice. (but she didn't)
Criticism of Past Actions
He shouldn't have said that. (it was wrong to say it)
You shouldn't have spent so much money. (it was a bad decision)
They shouldn't have ignored the warning. (it was a mistake)
| Should Have (Positive) | Shouldn't Have (Negative) |
|---|---|
| I should have called. (I didn't call, but I wish I had) |
I shouldn't have called. (I called, but I wish I hadn't) |
| She should have accepted. (She didn't accept → mistake) |
She shouldn't have accepted. (She accepted → mistake) |
Use 5: Conditional Sentences
Should can replace if in formal conditional sentences:
| Standard (with if) | Formal (with should) |
|---|---|
| If you need help, call me. | Should you need help, call me. |
| If there are any problems, let me know. | Should there be any problems, let me know. |
| If you have questions, ask. | Should you have questions, please ask. |
Use 6: Expressing Surprise or Emotion
In questions with why or how, should can express surprise, frustration, or indignation:
Why should I help him? (I don't think I should—indignation)
How should I know? (I don't know—frustration)
Why should it matter? (I don't think it matters)
Who should appear but John! (surprise—John unexpectedly appeared)
Should vs Other Modals
| Modal | Strength | Example |
|---|---|---|
| must | Strong obligation/certainty | You must wear a seatbelt. (it's the law) |
| have to | External obligation | I have to work tomorrow. (no choice) |
| should | Advice/recommendation | You should exercise more. (it's good for you) |
| ought to | Same as should (formal) | You ought to apologize. (it's the right thing) |
| could | Suggestion (weaker) | You could try this. (just an option) |
| might | Possibility (weakest) | You might like this. (maybe) |
Comparing obligation strength:
You must stop. (absolutely necessary—law/rule)
You have to stop. (required—external pressure)
You should stop. (advisable—recommendation)
You could stop. (optional—suggestion)
Should vs Ought To
Should and ought to have the same meaning, but there are subtle differences:
| Should | Ought To |
|---|---|
| More common | Less common, more formal |
| Used in questions easily | Rare in questions |
| Should I go? âś“ | Ought I to go? (awkward) |
| You shouldn't worry. | You ought not to worry. (formal) |
Common Expressions with Should
| Expression | Meaning & Example |
|---|---|
| I should think so | I certainly agree "Will they come?" "I should think so!" |
| I should hope so | I expect/hope this is true "Did he apologize?" "I should hope so!" |
| I should say | Expressing opinion emphatically "Is she talented?" "I should say she is!" |
| as it should be | The proper/correct way Everything is as it should be. |
| should the need arise | If necessary (formal) Contact us should the need arise. |
Common Mistakes to Avoid
Mistake 1: Writing "should of" instead of "should have"
Mistake 2: Using "should" with another modal
Mistake 3: Adding -s for third person
Mistake 4: Using infinitive with "to" after should
Mistake 5: Confusing should have (past) with should (present/future)
Summary
Should is a versatile modal verb with multiple uses:
- Advice: You should try it.
- Soft obligation: We should respect others.
- Expectation: She should be here soon.
- Past regret: I should have listened. (should have + past participle)
- Past criticism: You shouldn't have done that.
- Formal conditional: Should you need help, ask.
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