To hit or knock someone/something by accident; to meet someone unexpectedly
I was so (bored / boring) on my date--I wanted to leave!
BORED
0 Conditional
If I (be hungry) __________, I (eat) __________. 
If I am hungry, I eat.
CHORE
CONSUMER
Do you think the lectures your economics professor gives are (interested / interesting)? I don't!
INTERESTING
Conditional 1
If I (fail) __________ this class, my parents (be upset) __________.
If I fail this class, my parents will be upset.
ALTER
to believe something without checking whether it's true
ASSUME
My cat is truly (frightened / frightening) by loud noises.
FRIGHTENED
Conditional 2
If he (be smart) __________, he (try to save) __________ more money.
If he were smart, he would try to save more money.
SUFFICIENT
FRUSTRATING
SATISFYING
Conditional 3
If I (know) __________ your car broke down, I (help) __________ you.
If I had known your car broke down, I would have helped you.
Causing dependency
ADDICTIVE
Noun: something you buy
Verb: to buy (polite)
PURCHASE
SURPRISING
Conditional 3
If she (not be asleep) ___________, she (can watch) __________ the meteor shower with us. 
If she had not been asleep, she could have watched the meteor shower with us.
RETAIL