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While both are pronounced with the same sound, the words to and too do have different meanings and uses. The misuse of these words is actually quite common and an easy mistake to make when writing.
The word ‘to’ comes before a verb or a noun in a sentence and describes an action, recipient or a place. Here are some examples:
I’m going to get a new dress at the mall.
(The word ‘to’ comes before an action.)
I sent a letter to my sister.
(The word ‘to’ comes before a recipient)
This summer we are going to the beach.
(The word to comes before a place.)
The word ‘too’ using two o’s can be used in place of the words ‘as well’ or ‘also.’ Here is an example.
My brother works at the post office, too.
It also can be used to describe an excess or extreme. An example is below.
I’ve had too much coffee this morning.
Hope this helps