31. moderner ⇒ more modern

S + be+ more + ADJ + than + O : ss hơn của ADJ dài

32. know ⇒ knew 

S +said+(that) + S+V (lùi thì)

HTĐ ⇒ QKĐ

33. For Mông ethnic ⇒ For the Mông ethnic 

the + N :đã xác định

34. There are different ethnic groups in Viet Nam.

There are + N số nhiều 

ADJ + N 

35. I was doing my homework when I saw a UFO.

QKTD + when  + QKĐ

36. Jerry said that she wanted to become a famous teacher. 

S +said+(that) + S+V (lùi thì)

HTĐ ⇒ QKĐ

a + ADJ+ N 

`color{orange}{~MiaMB~}`