A softball player from a Queens high school claims she broke her ankle during practice because she had no idea how to slide — despite the fact she was on the varsity team, according to a lawsuit her family threw at the city.

Francis Lewis HS sophomore Alina Cerda had to have a plate implanted in her ankle after the May mishap, said her lawyer, Clay Evall.

“They were doing a sliding drill without any instruction,” he said. “This is not the Marines. These are young girls and you have to give some training.”

The city Law Department is reviewing the suit. Bryan Brown, the softball coach, who was also named, did not immediately respond to an e-mail for comment.