HTĐ:

     (V be): +) I am a student

                  -) I amnot a student

          nghi vấn) Am I a student ? ⇒ yes, I am ; no, I amnot

       (V thg): +) I often go to school 

                  -) I donot often go to school

          nghi vấn) Do I often go to school ? ⇒ yes,I do ; no,I donot

HTTD:   +) she is cooking dinner now

              -) she isnot cooking dinner now 

      nghi vấn) Is she cooking dinner now ? ⇒ yes,she is ; no,she isnot

QKĐ:

   (V be):   +) he was at home yesterday 

                 -) he wasnot at home yesterday 

             nghi vấn) Was he at home yesterday ? ⇒ No,he wasnot  ; yes,he was

   (V thg):   +) I played soccer two days ago

                  -) I didnot play soccer two days ago

        nghi vấn) Did you play soccer two days ago ? ⇒ yes,I did  ; No,I didnot

HTHT:  +) my parents have bought a new car 

             -) my parents havenot bought a new car

       nghi vấn) Have my parents  bought a new car ? ⇒ yes,my parents have ; No,my parents havenot