From Teflpedia

To (/tu:/) is an English word that can function as a preposition or a particle.[1] It is the third most common word in English, after the, and various inflections of the verb be. The prepositional and particular usage are fundamentally related.

As a particle, it’s used to form the to-infinitives of verbs, so is the English infinitive particle.

As a preposition, its primary meaning is as a preposition of direction meaning "in the direction of". For example, "We’re going to the swimming pool later". To can serve as the head of a preposition phrase, known as a to phrase.

To forms the head of the double prepositions "into", "unto", "up to".

Pronunciation; there is a strong form /tu:/ and a weak form /tə/. The strong form is a homophone with the cardinal number two, and the adverb too.

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