The magic of the word called "To"

The word "To" has several functions, as a preposition it shows that  one noun or  pronoun is taking some action in some  direction. This  can be observed  in the subsequent list:

1. I am going to Canada
2. He is talking to you.
3. Let's go to the beach (the verb 'let' is telling the pronoun 'us' to go to the beach)

As a particle of the infinitive verb, it tells us the following:

1. The reason of an action ( I am studying French to work in France)
2. The reason of a reaction (To watch her sing makes me cry)
3. Result  (He was able to complete the report in time)

Infinitives are verb forms that combine with "To" or without it to talk about reasons and reactions in relation to different kind of actions.