Jawaban:

1.(+)John always helps his mom.

 (-)John always doesn't help his mom.

 (?)Does John always help his mom?Yes, he does/No, he does

2.(+)My friends study together sometimes.

  (-)My friends don'tstudy together sometimes.

  (?)Do my friends study with me?Yes, he or she does/No, he or she does

3.(+)Martha watches a movie at the cinema.

  (-)Martha doesn't watches a movie at the cinema.

  (?)Does Martha watch a movie in the cinema? Yes, she does/No, she does

4.(+)Our mother usually cooks yellow rice.

  (-)Our mothers usually don't cook yellow rice.

  (?)Does our mother usually cook yellow rice? Yes, she does/No, she does

Sorry if the answer is wrong