Phrasal verbs
Modals- Obligation, Necessity, premission, possibility and prohibition
Future- will, may, be going to
First conditional
Present Perfect
For / Since
100

If you see an alligator, you should ________ from it.

run away

100

This is really serious. You ________ tell anyone.

a. can  b. can't  c. have to  d. don't have to

b. can't

100

Good bye. Maybe I ________ (see) you tomorrow.

will see

100

Polar bears _______ (disappear) if global warming _______ (continue).

will disappear, continues

100

I __________ (work) here for / since 2005.

have worked, since

200

If a puma comes near you, you should ________ with sticks and rocks. Try to appear as big as possible and make aggressive noises. 

fight back

200

He has lots of time. He _________ hurry.

a. can  b. can't  c. has to  d. doesn't have to

d. doesn't have to

200

It's very dark and cloudy. Take an umbrella. It __________ (rain) before you get to school.

is going to

200

Sit still! The dog _________(not come) to you if you _______ (not be) relaxed.

won't come, aren't

200

She __________ (have) her bike for / since 2 years.

has had, for

300

If you are attacked by bees, you should run away. If you run through bushes, the bees will _______________. 

slow down

300

I _______ go to the party this weekend if my parents let me.

a. must  b. can  c. don't have to  d. can't

b. can

300

I _______ (go) to the doctors tomorrow. I'll see how I feel in the morning.

may go

300

I ________ (study) for my exam when the movie ______ (end).

will study, ends

300

__________ (he / be) back to the US for / since last Christmas?

Has he been, since

400

Bears are very fast and can climb trees. If you see one, don't try to __________. Stay calm and move away slowly.

get away

400

You ___________ bring any food to the party. We will cook for everyone.

a. mustn't  b. must  c. don't have to  d. may

c. don't have to

400

Do you think you _______ (live) in a foreign country someday?

will live

400

Before we _______ (eat) dinner, I __________ (go) to the bakery to get some bread.

eat, will go

400

Judith __________ (not talk) to her parents for / since last month.

hasn't talked, since

500

It's best to __________ from bears and they don't want to be near humans either. If you _________ a bear, don't run. It's better to play dead if you are attacked.

stay away, come across

500

If you don't study, you ______ fail your English exam.

a. have to  b. can't  c. may  d.  must

c. may

500

I'm meeting Susan after class today. We _________ (see) a movie at the cinema.

are going to see

500

If all of the insects _______ (die), the ecosystem ________ (collapse). 

die, will collapse 

500

We __________ (study) English for / since years.

have studied, for