37. People shouldnt sweep the house on the first day of Tet.

(It's not good = Shouldn't + V-inf = không nên)

38. Mary is interested in a custom of doing morning exercise in my family.

(like + N = tobe interested in + N = thích cái gì)

39. Do we have to finish the work today?

(It is necessary to do st: cần thiết làm gì = have to do st: phải làm gì)

40. Nick has studied Vietnamese's customs for two years.

(S + began + Ving + thời gian trong quá khứ = S + have/has + V-P2 + for + khoảng thời gian)

$\text{37.}$People shouldn't sweep the house on the first day of Tet.

→ It's (not) good to do sth = should (not) do sth 

$\text{38.}$Mary is interested in a custom of doing morning exercise in my family.

→  like + N/V-ing = be interested in + N/V-ing 

$\text{39.}$Do we have to finish the work today?

→ It's necessary for sb to do sth = have to + V-inf : cần phải làm gì 

$\text{40.}$Nick has studied Vietnamese's customs for two years.

→ S + started/began +to V/V-ing + ... 

→ S + has/have + Vpp + .... 

$#Keisha$