It is dangerous to ride a motorbike without a helmet.
You're playing with fire if you insist on riding your motorcycle without a helmet on.
It can be dangerous for young people to ride motorcycles.
Two people riding on a bicycle at the same time is dangerous.
She cannot ride a motorcycle, not to mention a bicycle.
A scooter is convenient for getting around town.
The motorcycle that I have is a scooter type.
I have never ridden a motorcycle before.
Running and riding motorcycles is my life.
Motorcycles are very cheap.
My grandmother can ride a motorcycle, and what's more, a bicycle.
This mountain bike really comes into its own on a rough road.
My bike isn't anything like yours.
My bike is not anything like yours.