a bit

These trousers are a bit tight.

‘Are you tired?’ ‘Yes, I am a bit.’

A bit of

Would you like a bit of chocolate?

I have a bit of a fever 

I'm a little bit tired.

a bit / a little 

These shoes are a bit tight.

I’ll be a bit later home tomorrow.

These shoes are a little bit too tight.

I’ll be a little later home tomorrow

Acouple of

The couple celebrated their goldenwedding in January.

I have a couple of things to do now.

We went there a couple of years ago.

a couple of minutes/hours/days/weeks/months

pair  

a pair ofshoes/boots

a pair oftrousers/pants/jeans

a pair of swans

pair v

Each blind student was paired with a sighted student.