2, is buying (grandfather ⇒ chia số ít; buy ⇒buying)
3, is not studying (tên riêng ⇒ chia số ít; study ⇒ studying
4, Is she running (She ⇒ chia số ít; run ⇒ running)
5, is eating (dog ⇒ chia số ít; eat ⇒ eating)
6, are you waiting (you ⇒ chia số nhiều, wait ⇒ waiting)
7, are not trying (students ⇒ chia số nhiều, try ⇒ trying)
8, are having (All of + N ⇒ chia số nhiều, have ⇒ having)
9, are traveling (children ⇒ chia số nhiều, travel ⇒ traveling)
10, is drinking (little brother ⇒ chia số ít; drink ⇒ drinking)
11, is speaking (teacher ⇒ chia số ít; speak ⇒ speaking)
