Can I say,
(a) My hobby is playing game boy / “game boy”.
(b)My hobby is playing computer games / … is playing PS2.
(c)John’s Maths teacher praises John well in the Math’s exam.
(d)The traffic is not very busy. / The city is not busy.
(e)He talks a story to the parents.
(f)She praises the boy to do well. / The teacher praises John because he does / did well in the exam.
(g)He waved to his father before he left.