'The popcorn comes at a value', 'The popcorn isn't free', 'The popcorn Charge $10', 'You need to buy the popcorn' or, only, 'The popcorn is just not free'. The statement, 'You normally takes your infant to the flight free of charge' will be in opposition to 'You need to shell out to take your child over a airplane' or 'It's not free', or informally