English Grammar Usage of Can & Could

Usage of Can & Could

Can

Used to express ability (to be able to do something):

• I can make jewellery.
• He can’t speak French.
• Can you open this jar?

Used to ask for permission:

• Can I use your bathroom?
• Can I leave now?
• Can I raise the volume?

Used to make requests or suggestions:

• Can I have more napkins?
• Can I have the bill?
• You can take this spot if you like.
• You can do whatever you want.

Could (past form of can)

Describes an ability that someone had in the past:

• I could swim when I was young.
• You could see the boat sinking.
• They could tell he was nervous.

Often used in auxiliary functions to express permission politely:

• Could I take this jacket with me?
• You could borrow my umbrella.
• Could you please let me pass you?
• Could I get you more water?

Used to express possibility:

• All of them could ride in the van.
• You could always stay at our house.
• Could it be true?
• This plan could really work out.