Could you trim my moustache?

Could you call a taxi for me?

couldn’t get it out of my head

I couldn't have said it better myself.

We couldn’t get to the bottom of it

I couldn’t agree less

I couldn’t agree more

I couldn’t help laughing

I couldn’t help thinking

I couldn’t care less

I couldn’t believe my eyes.

I couldn’t believe my ears.

couldn’t-care-less attitude

I couldn't have done it without your help. Thank you.

I couldn't tell him the truth.

I couldn't understand a word.

I couldn't find my glasses.

He couldn’t care less about what’s going on around him

We couldn't live without water.

Couldn’t be buggered!

We couldn't live without plants.

I couldn’t get a word in edge-wise

We couldn't see anything in the dark.

I couldn't resist.

I couldn’t do a thing like that. Not on your life!