to
Pronunciation: /tə; before a vowel , tʊ; stressed , tuː/
preposition
- 1expressing motion in the direction of (a particular location): walking down to the shops my first visit to Africa
- expressing location, typically in relation to a specified point of reference: forty miles to the south of the site place the cursor to the left of the first word
- expressing a point reached at the end of a range or after a period of time: a drop in profits from £105 m to around £75 m from 1938 to 1945
- chiefly British (in telling the time) before (the hour specified): it’s five to ten
- 2approaching or reaching (a particular condition): Christopher’s expression changed from amazement to joy she was close to tears
- expressing the result of a process or action: smashed to smithereens
- governing a phrase expressing someone’s reaction to something: to her astonishment, he smiled
- 3identifying the person or thing affected by or receiving something: you were terribly unkind to her they donated £400 to the hospice
- 4identifying a particular relationship between one person and another: he is married to his cousin Emma he’s economic adviser to the president
- used in various phrases to indicate how something is related to something else (often followed by a noun without a determiner): made to order a prelude to disaster
- indicating a rate of return on something, for example the distance travelled in exchange for fuel used: my car only does ten miles to the gallon
- (to the) Mathematics indicating the power (exponent) to which a number is raised: ten to the minus thirty-three
infinitiveMarker
- 1used with the base form of a verb to indicate that the verb is in the infinitive, in particular:
- expressing purpose or intention: I set out to buy food I am going to tell you a story
- expressing an outcome or result: she was left to die I managed to escape
- expressing a cause: I’m sorry to hear that
- indicating a desired or advisable action: I’d love to go to France this summer the leaflet explains how to start a course
- indicating a proposition that is known, believed, or reported about a specified person or thing: a house that people believed to be haunted
- (about to) forming a future tense with reference to the immediate future: he was about to sing
- after a noun, indicating its function or purpose: a chair to sit on something to eat
- after a phrase containing an ordinal number: the first person to arrive

Origin:
Old English tō (adverb and preposition), of West Germanic origin; related to Dutch toe and German zu

Do not confuse to with too or two. To usually means 'in the direction of' ( the next train to London); too means 'excessively' ( you’re driving too fast); two is the number between one and three.