EF 5/6 Modals/ Modal auxilairies

subjects & predicates - main, complete

You can apologize any time.

modals, modal auxilairies
can
may
might
could
should
would
must
shall very low-frequency word, not used much
will

modal + infinitive -to
can + to ABC
can to go
I can go to the party.

I go to the party.
Maria goes to the party.

I can go to the party.
Maria can go to the party.

I can study French in September.
Joe can study French in September.

Joe can to study. XXX
Joe can studies. XXX
Joe can studied. XXX

You should to be nice to your friends.

Two-word modals
had better - really should "You had better to finish your chores or I am going to throw your PS4 in the garbage."
  
have to - must "I have to to pick up some milk after school."
"I have pick up some milk after school." XXX

ought to - should "All English students ought to practice speaking as much as they can."
"English students all ought to practice speaking as much as they can." together, like a group

"All of the kids are playing in the park."

"The kids are all playing in the park." nice group, fun

"The kids all are playing in the park."

used to - did in the past "I used to love you, but not anymore."
"Marie used to do yoga, but she is too busy now." 
"I used to take my kids my school in the morning."
Not anymore.
"I always take my kids to school."


Three-word modals

be able to - can
"I can play guitar. I can't play piano."
"You are able to do whatever you choose to do."

be going to - will
be supposed to - should
have got to - must must must, very strong
"You have got to lock the door when you leave the house."