The document discusses various situations where different modal verbs (can, could, may, might, must, should) are used to indicate possibility, permission, necessity or obligation. Some examples include that Ted should be exhausted after an 11 hour flight; hiking a trail might be dangerous without preparation for weather changes; and a plant could die without enough water.

1. The penalty game

2. Have to Must Should
Ted's flight from Amsterdam took more than 11 hours.
He ______ be exhausted.

3. Should
Hiking the trail to the peak _______ be dangerous if you are not
well prepared for dramatic weather changes.
Might Can

4. Might
Dave: ______ you hold your breath for more than a minute?
Can
Should

5. Have to Should
Jenny's engagement ring is enormous! It ______ have cost a
fortune.
Must

6. Can Must
Please make sure to water my plants while I am gone. If
they don't get enough water, they ______ die.
Could

7. Should
I ________ speak Arabic fluently when I was a child and we lived
in Egypt.
Could Can

8. Can
The book is optional. My professor said we ________ read it if we
needed extra credit.
Could Should

9. Could Must
You __________ take your umbrella along with you today. It will
rain.
Should

10. Can
I really _________ use the bathroom!
Have to
Should

11. I _________ speak Arabic fluently when I was a child and we lived
in Egypt.
Could Have to
Can

12. Might Should
Ned: __________ I borrow your lighter for a minute?
Can

13. Can
__________ you always say the first thing that pops into your
head?
Must
Have to

14. Could Should
Oh no! Frank's wallet is lying on the coffee table.
He _________ have left it here last night.
Must