To is a preposition and a versatile little word that can be used to say many things. You can use it to indicate a goal or a direction of movement, as well as a place of arrival. That’s the way you use it when you say you’re going to class tomorrow. To also plays a role when we want to indicate that a verb is an infinitive.

There are other things for which we use the word to, but by now you should know enough of them to make sure you notice the difference between it and too.

How to Use Too

Too is also a useful little word, but it’s not a preposition like to, and it doesn’t have as many meanings. You can use it instead of “besides,” “in addition,” “also,” or “as well.” But you can use it for other things, too, like when you want to indicate excessiveness. If you find grammar tough, you can say that it’s too hard. In casual speech, speakers sometimes use too in the sense of “very”: That gal is too funny!