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to (EN)
particle, preposition

particle “to”

to
  1. marks the following verb as an infinitive
    She decided to study abroad for a year.
  2. marks an infinitive that is understood from the context
    "Will you go there?" "Oh yes, I am planning to."
  3. indicates that someone is supposed to or expected to do something
    The children are to be home by 9 PM.
  4. shows the purpose or reason for doing something
    He saved money to buy a new bicycle.

preposition “to”

to
  1. indicates a destination
    Let's head to the beach this weekend.
  2. identifies who receives something or is affected by an action
    Please pass the salt to your sister.
  3. shows what something changes or transforms into as a result of an action
    The apple was cut to pieces.
  4. describes a feeling or emotion caused by something
    To her immense joy, the lost puppy found its way home.
  5. relates an adjective to the person or thing it describes
    Be nice to your brother. Why are you so mean to me?
  6. specifies the limits of a range
    The store is open from 9 AM to 6 PM.
  7. indicates a ratio
    The ratio of students to teachers is 20 to 1.
  8. indicates that a number is to be used as an exponent in mathematics
    Two to the power of three equals eight.
  9. tells the time remaining before the next hour
    I'll meet you at quarter to five.
  10. explains the content of something or the difficulty in something
    There's more to this story than meets the eye.
  11. according to
    It seems that everything went to plan.