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
