Who was last to see him?

I hope we've seen the last of him

He left a lasting impression

They have it down to the last detail

I would only use that as a last resort 

It's last call

Who ate the last cookie?

I'm always the last to know!

I know what you mean

Mum knows best 

Best we listen then

You're the best thing since sliced bread 

Best be getting home now

The best things in life are free

Not your best work

Put your best foot forward 

Never go straight, go forward

(a phrase from my party days lol)

From this day forward

You're not backward at coming forward 

Going forward we need to change a few things.

A change will do you good

Your mood changes like the weather 

You need to change with the times

The Times they are a changing

It's time you got a watch