5-.It's Tom's ages will be twenty next week

3-I haven't seen Bob since I was in Ho Chi Minh city.

1, MY BROTHER STUDIES NOW HARDER THAN HE USED TO
->MY BROTHER didn't use to study as/so hard as he does now.
or MY BROTHER used to study more lazily than he does now.
2 PLEASE DON'T ASK ME THAT QUESTION
-> I'D RATHER you didn't ask me that question.
3 I LAST SAW BOB WHEN I WAS IN HCM
-> I HAVEN'T seen Bob since I was in Ho Chi Minh City.
4 JOHN ONLY UNDERSTOOD VERY LITTLE WHAT THE TEACHER SAID
-> JOHN COULD HARDLY understand what the teacher said.
5 , TOM WILL BE TWENTY NEXT WEEK
-> IT'S TOM'S twentieth birthday next week.