Gerund - DOING
Infinitive - TO DO
It involves rolling downhill. - 3
Gaining access to the top of them usually involves some form of unlawful entry. 1
Before making your first jump. 2
PREPOSITION + ING
Need to - infinitive
Began jumping
Prevent something coming
Both gerund and infinitive
You hair needs cutting - it is time you cut your hair
begin to do/begin doing
start to do/ start doing
suggest + ING
arrange TO
can't help smiling
learn to do something
help to improve
consider ING
promise to
finish + ING
refuse TO
keep ING - continue
commuting
to commute to school/work
Studying English is my favorite activity.