The boys are about to reach.
The boys are about to arrive.
When should I use reach and when should I use arrive?
The boys are about to reach.
The boys are about to arrive.
When should I use reach and when should I use arrive?
Reach is transitive when referring to a destination, meaning it needs a direct object. So you want to say
The boys are about to arrive.
Or, you could say
The boys are about to reach their destination.