Won't is the contraction of will not. According to my dictionary it was first recorded mid-15th century as wynnot, later wonnot (1584) before the modern form emerged 1667.
8689
It will.
Haven't is the contraction of have not.
contraction made from the two words you will: you'll
Let's is the contraction of the two words 'Let us'
Contraction word made from the words they and are is they're.
It will.
You are.
It is
"Weren't" is a contraction. It is composed of the words "were" and "not".
"Shan't" is a contraction of "shall not".
Won't is a contraction of will not.
'I' and 'HAVE'
The two words that make up the contraction let's are let and us.
They and are make up they're
Haven't is the contraction of have not.
contraction made from the two words you will: you'll
Would've is would have