Basic Guidelines For English Spellings
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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.