Many times teachers will tell you to go onto the next question if you do not know the answer.
The mysterious creature jumped onto the log.
The mechanic drove the customer's car onto the ramp.
His confidence was shattered by the failure of the experiment. She stepped onto the stage with confidence after her coach gave her the pep talk.
The thermos fell of the car onto the road.
I'm going to collapse onto the floor.
Rocks can tumble dangerously onto the road.
Fresh bait was being loaded onto the barge.
He came onto me like he thought he was a real Casanova.
He rose through the ranks of the company by hanging onto the tails of my waiscoat.
When she stepped onto the stage, she was silhouetted by the bright lights behind her.
She emitted a loud cry before collapsing onto the floor.
The only plural noun in the sentence is 'rails', the singular noun is 'rail'.The sentence using the singular noun:"The thick rail provided a place to hold onto."