Exe V:

câu 1: decided

câu 2: saw

câu 3: Have you see/ didn't saw

câu 4: learn/ learning/ was

câu 5: have you ever is/ isn't/ been

câu 6: did/ geting

câu 7: has join/is/ has serve/ went

câu 8: live/ lived

câu 9: has finish/ been

câu 10: went

câu 11: worked/ leaving

câu 12: Have you ever been

câu 13: rised

câu 14: has just finishing

câu 15: don't building

 Exe VI:

câu 1 :I haven't seen Nam since three years ago

câu 2 :I have never used a computer as good as this one

câu 3: She hasn't visit me five months ago

câu 4: we have been best friends for a long time

câu 5: Minh has collected stamps since 2006

câu 6: How long do you forget her?

câu 7: It's the most fun movie I've ever seen

câu 8: It's ages he hadn't spoken to his classmates over the Internet