b)-err
c)-est.
2. Gerund is used:
a) after
preposition b) after suffixes
c)after prefixes
3. Gerund is used:
a) infinitive
b) object
c) article
4. Gerund is used:
a) after idioms
b) phrasal verb
c) after adverb
5. Gerund is used:
a) adjective
b) plural nouns
c) subject