Based on the instruction in this website, I can come up with some following sentences:
I would prefer to drink tea rather than to drink coffee.
I'd prefer to drink tea rather than drink coffee.
I'd prefer to drink tea rather than coffee.
I'd prefer to drink tea to coffee.
I'd prefer tea to coffee.
I'd prefer tea rather than coffee.
I'd prefer tea.
I think (4) is wrong, (1), (2) & (7) are definitely right. But not sure (3), (5) & (6).
So, which one is correct?