"-ing words."
Brain,
When using words ending in "-ing," a simple rule of thumb is that you drop the vowel coming at the end of the base (or stem) word.
For example:
Look at your last sentence. "changeing"
Doesn't that just LOOK wrong to you?
The correct word would be "changing."
It's easy.
I know you don't care about this stuff, and I'm really not trying to be a dick, but maybe my general rule of thumb will help you out.
Other words to consider:
Raising ... not: raiseing
Living ... not: liveing
etc.
For your reference, I "googled" this link for you:
__________________
|