Invalid OR Valid

If I plant a tree, then I will get dirt under my nails. I didn’t get dirt under my nails. Therefore, I didn’t plant a tree

• Valid

• Invalid

If I don’t change my oil regularly, my engine will die. My engine died. Thus, I didn’t change my oil regularly.

• Valid

• Invalid

All frogs are amphibians. All frogs have gills. Therefore, all amphibians have gills.

• Valid

• Invalid

You will meet a tall, handsome stranger or you will stay home and pick fleas off of your cat. You didn’t meet and tall, handsome stranger. Therefore, you stayed home and picked fleas off of your cat.

• Valid

• Invalid

If I don’t tie my shoes, then I trip. I didn’t tie my shoes. Hence, I tripped.

• Valid

• Invalid

All racers live dangerously. Gomer is a racer. Therefore, Gomer lives dangerously.

• Valid

• Invalid

If you aren’t polite, you won’t be treated with respect. You aren’t treated with respect. Therefore, you aren’t polite.

• Valid

• Invalid

If you are kind to a puppy, then he will be your friend. You weren’t kind to that puppy. Hence, he isn’t your friend.

• Valid

• Invalid

If you drink Surge, then you won’t fall off of your skateboard. You fell off of your skateboard. Therefore, you didn’t drink Surge.

• Valid

• Invalid

If I don’t pay my income taxes, then I file for an extension or I am a felon. I’m not a felon and I didn’t file for an extension. Therefore, I paid my income taxes.

• Valid

• Invalid