Modal auxiliaries 9th std

Auxiliaries, Modals and Main verbs

be, have and do can be auxiliaries and main verbs. They have grammatical functions and are used for forming tenses, questions, the passive, etc.

Modals are can, could, may, might, must, ought to, shall, should, will, would and need (need can also be a main verb).

Examples:

• We can play football.
  

  What to keep in mind when using modals

  Explanation	Sample sentences
  Do not use modals for things which happen definitely.	The sun risesin the east. - A modal can't be used in this sentence.
  They have no -s in the 3rd person singular.	He can playfootball.
  Questions are formed without do/does/did.	Can he speakSpanish?
  It follows a main verb in its infinitive.	They mustread the book.
  There are no past forms (except couldand would).	He was allowed towatch the film.
  When you use the past participle you tell about things which did not happen in the past.	You shouldhave told me.