English
posted by John .
1. How much gas do you need?
(What does gase mean? Just gas or gasoline?)
2. I ate a piece of watermelon.
3. I ate two pieces of watermelon.
4. I ate a piece of watermelons.
5. I ate two pieces of watermelons.
(Which ones are correct?)

The word "gas" is usually short for "gasoline"  especially when referring to cars. The word "gas" can also be referring to natural gas, a different fuel that is used mostly for cooking and heating.
2 and 3 are correct; 4 and 5 are incorrect. 
They all are correct gasoline is a short word for gas so all the of the answers are correct
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