A broom tree?! 
In our driveway!

And he lay down and slept under a broom tree. And behold, an angel touched him and said to him, “Arise and eat.” I Kings 19:5

1. I could work on Saturdays.
2. I must work on Saturdays.
3. I need to work on Saturdays.
4. I have to work on Saturdays.
5. I mustn't work on Saturdays.
6. I couldn't work on Saturdays.
7. I don't have to work on Saturdays.
8. I shouldn't work on Saturdays.
9. I should work on Saturdays.
10. I might work on Saturdays.

Match the above with their meaning:

1. It's absolutely necessary for me to work on Saturdays.
2. It's absolutely necessary for me to work on Saturdays and someone forces me to do so.
3. I'm unable to work on Saturdays.
4. It isn't necessary for me to work on Saturdays.
5. It's possible for me to work on Saturdays.
6. It's important for me to work on Saturdays.
7. It's a good idea for me to work on Saturdays.
8. It's forbidden for me to work on Saturdays.
9. It isn't a good idea for me to work on Saturdays.
10. It's a possibility that I might work on Saturdays.