The following spelling rule explains that "hoping” is spelled “hoping” rather than "hopping or "hopeing.

1. when the suffix begins with a vowel, keep the "e" on the main word and add the suffix.

2. when the suffix begins with “e," drop the "e" on the main word and add the suffix.

3. when the suffix ends in “e," drop the "e" on the main word and add the suffix.

4. when the suffix begins with a vowel, drop the "e" on the main word and add the suffix.