Jawaban:

1.this apartment would be perfect if the rooms were a little bit larger

this aoartment would have been perfect if the rooms had been a little bit larger

2.if i finished my assignment tonight,i would go to mall with my friends

if i had finished my assignment tonight,i would have gone to mall with my friends

3.they would bring the cakes if the baker finished it

they would have brought the cakes if the baker had finished it

4.if my brother studied hard,he would pass the exam well

if my brother had studied hard,he would have passed the exam well

5.my brother would buy me a new motorcycle if i passed the state university test

my brother would have bought me a new motorcycle if i had passed the state university test