Proper usage of should and could

The Difference Between “Should” and “Could” in English

Learning how to use modal verbs like should and could is important for expressing advice, ability, possibilities, and suggestions. This lesson will help you understand the difference between these two commonly used words in English.

1. What Does “Should” Mean?

Should is used to give advice, recommendations, or to talk about what is the right thing to do.

Examples:

• You should study for your exam. (advice)
• She should eat healthier. (recommendation)
• They should be here by now. (expectation)

Structure: Subject + should + base verb

Example: He should go to the doctor.

2. What Does “Could” Mean?

Could is used to talk about possibility, past ability, or to make polite requests or suggestions.

Examples:

• We could go to the beach tomorrow. (possibility)
• She could swim when she was five. (past ability)
• Could you help me, please? (polite request)

Structure: Subject + could + base verb

Example: I could finish the project today.

3. How Are They Different?

The main difference is:

• “Should” is used for advice or moral obligation (what is right or recommended).
• “Could” is used for possibilities or past abilities (what is or was possible).

Compare:

• You should call your parents. (It's the right thing to do.)
• You could call your parents later. (It's a possible option.)

4. Quick Practice

Try to fill in the blanks with should or could:

1. i) You ______ take an umbrella. It looks like rain.
2. ii) He ______ play the piano when he was young.
3. iii) We ______ visit the museum this weekend.
4. iv) You ______ not eat too much junk food.

Understanding the difference between should and could helps you speak more clearly and accurately. Use should when you want to give advice or say what is right. Use could when you are talking about possibility or ability.

Practice these in your conversations and writing, and soon you’ll feel more confident using them!

Answers: i) should, ii) could, iii) could, iv) should