verb
1
BAD : He picked up a small stone and threw it to Sally's window.
GOOD : He picked up a small stone and threw it at Sally's window.
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You throw an object at the person or thing you want to hit (NOT to ): 'One day Dr Roseberry lost his temper and threw a book at me.'
2
BAD : Some smokers just throw their cigarette ends.
GOOD : Some smokers just throw their cigarette ends on the ground.
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throw sth + away/down/on the ground etc : 'You could save the paper for recycling instead of just throwing it away.'