Understanding 'Can' and 'Could' Usage

This video tutorial explains the differences between the modal verbs 'can' and 'could'. It covers their use in expressing ability, possibility, and polite expressions. 'Can' is used for present ability and general possibility, while 'could' is used for past ability and specific possibilities in the present, future, and past. The video also includes a quiz to test understanding.

What is the main focus of this lesson?

• The use of 'will' and 'would'.

• The difference between 'can' and 'could'.

• The difference between 'may' and 'might'.

• The use of 'shall' and 'should'.

Which of the following sentences correctly uses 'can' to express ability?

• They can be late yesterday.

• She can speak three languages.

• I can swim when I was a child.

• He can have gone to the party.

What does 'could' indicate in the sentence: 'I could play the guitar when I was in school'?

• Past ability

• Future possibility

• Present ability

• General possibility

Which sentence uses 'could' to express a possibility?

• She could swim every day.

• The train could be late.

• He could lift weights now.

• You could have a cold if you go out in the rain.

In which context is 'can' used to express general possibility?

• You can be late yesterday.

• You can have passed the exam.

• You can catch a cold if you go out in the rain.

• You can have gone to the party.

Which of the following is a polite suggestion using 'could'?

• Can you try the new restaurant?

• You can try the new restaurant.

• You could try the new restaurant.

• Could you try the new restaurant?

How is 'could' used in making requests?

• Could you pass me the salt, please?

• You can pass me the salt.

• Can you pass me the salt?

• You could pass me the salt.

Which sentence shows a polite offer using 'could'?

• You could help with that.

• Can I help you with that?

• Could I help you with that, madam?

• You can help with that.

When asking for permission, which is more polite?

• Can I borrow your pen?

• You could borrow my pen.

• Could I borrow your pen, please?

• You can borrow my pen.

What is the purpose of the quiz at the end of the lesson?

• To test understanding of 'shall' and 'should'.

• To test understanding of 'will' and 'would'.

• To test understanding of 'can' and 'could'.

• To test understanding of 'may' and 'might'.