Examples:
To ~
I am going to the shop
She said hello to me
Do you want to go to the bar?
From ~
I am from London
Where are you from?
Where did you buy that from?
Of ~
Can I have one of those please?
How many of them are there?
That was very nice of you
At ~
Sorry, I am at work
You are at home
I will meet you at 12 o'clock