Contrasting and Classifying

Contrasting

On the other hand,
However,
Yes, but . . .
You may be right, but . . .
I may be wrong, but . . .
Correct me if I'm wrong, but . . .

On the contrary,

Classifying

There are five kinds of . . .
There are two types of . . .
There are three categories of . . .

We can divide (this) into three parts:

1)
2)
3)
This can be broken down into four sections.
They are:
A)
B)
C)
D)