To-verbs are also known as "infinitive verbs".
A verb is a word that depicts an action. A verb in its basic form is called an infinitive form. It is generally in the form that appears in our dictionaries. The infinitive form of a verb is usually preceded by "to". Hence it is also called as "to verbs".
Read the following sentences from the lesson "Sound of Music":
1. Evelyn was determined to live a normal life.
2. Evelyn managed to conceal her growing deafness from friends and teachers.
Observe that the emphasized words are the "to-verbs". On a closer observation, it has to be noted that it usually answers questions beginning with "what".
What was Evelyn determined to do?
What did Evelyn manage to do?
When an infinitive verb is used, "to" is used as a "part of the verb" and not as a preposition. The verb will not be conjugated with -ed, -ing,-s etc.
to play
to dream
to expand
to use
The to-verbs used in the lesson are:
  1. to play
  2. to conceal
  3. to take
  4. to lead
  5. to give up
  6. to sense
  7. to open
  8. to make
  9. to watch
  10. to learn
  11. to work
Thesentences from the lesson "Evelyn Glennie Listens to Sound without Hearing It" sing to-verbs are as follows:
  1. Evelyn's mother remembers noticing something was wrong when the eight-year-old Evelyn was waiting to play the piano.
  2. Evelyn managed to conceal her growing deafness.
  3. Evelyn's headmistress urged her parents to take her to a specialist.
  4. Evelyn was determined to lead a normal life.
  5. Evelyn was not goingto give up.
  6. Ron Forbes told Evelyn to sense it some other way.
  7. "I had learnt to open my mind and body to sounds", said Evelyn.
  8. Evelyn had decided to make music her life.
  9.  It is intriguing to watch Evelyn function so effortlessly.
  10. She managed to learn French and master basic Japanese.
  11. "I’ve just got to work harder than classical musicians," said Evelyn.