uszczęśliwić in English:

I'm very happy.

Happy events tend to be accompanied by problems.

Happy is a man who is contented.

Happy Thanksgiving Day.

Did you have a lot of happy experiences in your childhood?

You can never be happy if you feel envious of other people.

If you wish to be happy, learn to be content with your condition in life.

No matter what your profession, or how happy you may be in it, there are moments when you wish you had chosen some other career.

Tom drew a happy face on the cover of his notebook.

I've never met anyone who makes me as happy as you make me.

Everyone is happy with the decision, so please don't rock the boat.

Jefferson was a happy president in those early days of 1801.

Mary waited years for Tom to get out of prison and was very happy when he finally got released.

I can't tell you how happy I am that you've come to visit us.

My five year old daughter always goes to kindergarten happy and full of energy.