I thought it was important.

I thought I was dying.

I thought it was worthwhile to clarify the matter

A thought crossed my mind

I thought you'd be happy for me.

I thought you'd have gone home.

I thought you weren't coming.

I thought as much!

I thought, Christ Almighty!

I thought better of it.

I thought it was a joke.

My thoughts exactly!

Thoughts are free.

a thousand pities

a thousand pardons

It’s a thousand pities she did not come

thousand

to thrash someone

to thrash out

Thread

My threadbare overcoat was an embarrassment

to threaten

to threaten to do something

Three is a lucky number

three score and ten