There is no such word.
The word mercy is a noun. Only verbs have an -ing form.
end ear ing
Picning
Going over educational material, or examining something closely, is called studying.
Hoping.The correct spelling is "hoping" (the E is dropped when adding -ing).The spelling hopping means moving in hops.
The -ing form is waving.
You would spell value with -ing on the end as valuing.When you add -ing to a verb, and that verb has a silent E on the end, you get rid of the E.
Practicing
planning
centering
Picning
end ear ing
It's bullying.
It is simply 'gossiping'.
The correct spelling is "gossiping".
Chase+ing is spelled chasing. You drop the 'e' and add '-ing'. The cat was chasing his tail.
That's not proper grammar. In such a case you are determining value. Not value "ing".
The correct spelling is "sticking."