This experience has taught me one thing ...

This colour suits you.

This sealed my fate

This house belongs to a friend of mine.

This is to confirm the appointment we made on …

This too will pass

This is a good place to shelter

This will do the trick

This will knock/blow your socks off!

This is a souvenir from Denmark.

This is my daughter.

This affair allows of no delay

This time I’m in earnest about it

This will not do

This ferry has been cancelled.

This university has a long tradition.

This is a present for you.

This regulation has yet again been violated

This dish has no taste

This will serve me

This day next week is Christmas.

thorn in the flesh

He’s a thorn in my side

a thorn in one’s flesh/side

He is a thorn in my side.