UK:*UK and possibly other pronunciationsUK and possibly other pronunciations weak: /ˈtu/ /tə/, strong: /ˈtuː/

US:USA pronuncation: IPAUSA pronuncation: IPA/tu; unstressed tʊ, tə/

US:USA pronunciation: respellingUSA pronunciation: respelling(to̅o̅; unstressed tŏŏ, tə)

WordReference Collins English Usage © 2020
To is used in several different ways as a preposition. Its usual pronunciation is /tə/. However, when it is followed by a word beginning with a vowel sound, it is pronounced /tu/ and when it comes at the end of a clause, it is pronounced /tuː/.
You use to when you mention the place where someone goes.
I'm going with her to Australia.
The children have gone to school.
I made my way back to my seat.
Don't use ‘to’ in front of here or there. Don't say, for example, ‘We go to there every year’. Say ‘We go there every year’.
Before I came here, there were a few offers from other clubs.
His mother was from New Orleans and he went there every summer.
Also, don't use ‘to’ in front of home.
I want to go home.
I'll pick the parcels up on my way home.
You can use to to show the place that a person is intending to arrive at.
We're sailing to Europe.
We used to go through Yugoslavia on our way to Greece.
However, don't use ‘to’ to show the general direction in which someone or something is moving. Don't say, for example, ‘The boat was drifting to the shore’. You say ‘The boat was drifting towards the shore’.
He saw his mother running towards him.
We turned to fly back towards Heathrow.
Toward is sometimes used instead of towards.
They walked along the pathway toward the house.
You also say that someone looks towards or toward something.
She glanced towards the mirror.
He stood looking toward the back of the restaurant.
You can use to to show the position of something. For example, if something is to your left, it is nearer your left side than your right side.
My father was in the middle, with me to his left carrying the umbrella.
To the west lies Gloucester.
You can also use to to show where something is tied or attached, or what it is touching.
I locked my bike to a fence.
He clutched the parcel to his chest.
To is sometimes used with a similar meaning to ‘until’.
Breakfast was from 9 to 10.
Only ten shopping days to Christmas.
indirect objects
You put to in front of the indirect object of some verbs when the indirect object comes after the direct object.
He showed the letter to Barbara.
Verbs (for information on ditransitive verbs)
used in infinitives
To is used for introducing a special kind of clause called a to-infinitive clause.
He was doing this to make me more relaxed.
She began to cry.
Be careful
Don't confuse to with too or two, both of which are pronounced /tuː/.
Be careful
You use too to show that what has just been said applies to someone or something else.
I'm on your side. Mike is too.
Be careful
You also use too when you want to say that an amount or degree of something is more than is desirable or acceptable.
Eggs shouldn't be kept in the fridge, it's too cold.
➜ See too
Be careful
Two is the number 2.
The two boys glanced at each other.
'to' also found in these entries:

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