Su: I like to play game.
Correct: I like to play a game or I like to play games.
Explanation: The indefinite article "a" refers to a particular or certain one of a class or group thing: a man; a chemical; a house.

Su: We have to brash our teeth.
Correct: We have to brush our teeth.
Explanation: The correct spelling is "brush".

Su: Denter is scary.
Correct: The dentist is scary.
Explanation: The definite article "the" is used especially before a noun.

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Hi, Su! You really are consistent when it comes to homework. Please do
 take note of the corrections particularly the spelling. Keep up the good work, Su!

-Teacher Isabel