"To" Or "Too"?

These are both commonly confused words but differ greatly in use and meaning. To can be used as a preposition:

We took the train to London.

It can also be used with a verb stem as part of a verb phrase:

I would like to see you soon.

This is not to be confused with too which can be used to describe something being done excessively:

You’re driving too fast.

It can also be used in place of ‘also’ or ‘as well’:

I would like some dinner too.

Of course, neither to nor too should be confused with two, the number between one and three.