How soon CAN you FINISH the paperwork? MAY I SEE your passport please?
HAVE TO has the same form and endings as regular verbs:
Tom DOESN'T HAVE TO WORK tonight. He HAS TO work tomorrow. Tim and Betty HAD TO WALK home from the party. DOES John HAVE TO work on Saturday? Where DID you HAVE TO GO to pick up your TV?
ABLE TO uses "be" helping verbs IS, ARE, WAS, WERE, HAS BEEN, etc.
When WILL you BE ABLE TO HELP me with my homework? WAS Barbara ABLE TO FINISH her work? I HAVEN'T BEEN ABLE TO GET a reservation for Sunday. Mary WASN'T ABLE TO FIND the address.
Other similar expressions are OUGHT TO and HAD BETTER:
I bought a brand new TV because they ___________ fix the old one.
shouldn't
had better not
couldn't
mustn't
They really ________ repair this road. It's so bumpy.
can
should
may
be able to
__________ please leave when I finish the exam ?
Had I better
Should I
May I
Ought I
You ___________ move your car or they'll tow it away.
can
'd better
are able to
may
You ____________ double-park. You could get a ticket or get towed away.
mustn't
don't have to
aren't able to
I'm sorry we can't come to your party, my husband ________ work Friday nights.
is able to
can
had better
has to
Tim doesn't look well. He _________ see a doctor
has to
can
may
ought to
You simply ___________ remember Sally's birthday. She'll be so disappointed if you forget.
must
can
may
ought to
What time _______ Ray leave for the station to catch a 7.30 train ?
can
should
had better
may
Is Tom away on vacation ? I __________ get him on the phone for two days.
can't
may not
haven't been able to
shouldn't
How long ________ wait for Bill last night ?
you had to
did you have to
must you
you must
Do you think you __________ us a hand when we move to our new apartment ?
may give
should give
can give
have to give
I'm very sorry. I'm afraid I _________ leave now. I'm late for an appointment.
must
may
can
ought
Brian's son wants to know when he __________ to get his driving licence.
can
'll be able
may
should
Kathy's boss said she __________ be late for work again or he'll fire her.
shouldn't
isn't able to
mustn't
doesn't have to
___________ you page someone for me please ?
May
Can
should
had better
Do you think I _________ have a ride to the airport ?
can
should
must
have to
We ___________ to eat lunch before we leave. We won't have time later.
should
must
ought
may
The teacher said today's class was important. You ________ miss it.
'd better not
may not
don't have to
aren't able to
Why ___________ to sign the surrender papers.
can't the delegation
wasn't the delegation able
mustn't the delegation
may the delegation not
Family treasures _________ really be handed down from father to son.
have to
should
must
are able to
_____________ we be seated in the piano bar please ?
can
must
had better
should
Do you think they ________ restore this run-down old hotel ? It's such a mess.
may
'll be able to
have to
must
I remember your face but I _________ recall where we've met.
can't
shouldn't
mustn't
don't have to
Tim _________ feel lonely during the holidays. He's like one of the family to us.
mustn't
can't
shouldn't
may not
You _________ read over your report again. I think I saw some mistakes in it.
could
may
ought
'd better
If you aren't busy on Sunday, you __________ go to the park. There's a concert in the afternoon
ought to
can
have to
may
Where ________ go to get a visa for Morocco ?
am I able to
I have to
do I have to
should
Bob said we _________ be at the airport at least an hour before our flight because it takes so long to check in.
ought
should
can
may
Why ________ to work late with the rest of the employees.