1.a)doesn't ride - present simple
b)isn't riding - present continuous
c)didn't ride - past simple
2.a)dont play -present simple
b)didnt play - past simple
c)aren't playing - present continuous
3.a)doesn't often buy - present simple
b)isn't buying - present continuous
c)didn't buy - past simple
4.a)am running - present continuous
b)didn't run - past simple
c)don't run - present simple