Definition of to infinitive marker from the Oxford Advanced American Dictionary

     

    to

     infinitive marker
    infinitive marker
    NAmE////
     
    , NAmE//tu//
     
     
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  1. 1To is often used before the base form of a verb to show that the verb is in the infinitive. The infinitive is used after many verbs and also after many nouns and adjectives. used to show purpose or intention I set out to buy food. I am going to tell you a story. She was determined to do well. His aim was to become president. To be honest with you, I don't remember what he said.
  2. 2used to show the result of something She managed to escape. It was too hot to go out. He couldn't get close enough to see.
  3. 3used to show the cause of something I'm sorry to hear that.
  4. 4 used to show an action that you want or are advised to do I'd love to go to France this summer. The leaflet explains how to apply for a position. I don't know what to say. To can also be used without a verb following when the missing verb is easy to understand:He asked her to come but she said she didn't want to.
  5. 5used to show something that is known or reported about a particular person or thing The house was said to be haunted.
  6. 6used to show that one action immediately follows another I reached the station only to find that my train had already left.
  7. 7 am, is, are, was, were to used to show that you must or should do something You are not to talk during the exam. She was to be here at 8:30 but she didn't arrive.
See the Oxford Advanced Learner's Dictionary entry: to