=>
1. Nowadays, the nuclear family is becoming more common in the cities.
-> thì HTTD (S is/am/are Ving)
2. Everyone was glad that the goverment had decided to invest more in education.
-> be adj that S V
3. The teacher asked us not to spend too much time playing computer games.
-> asked sb not to V : yêu cầu ai không làm gì
-> spend time Ving ~ take time to V
4. Customs and traditions make a great contribution to the unique culture of a country.
-> make a great contribution to : đóng góp to lớn
5. The goverment must take measures to preserve historical sites in the area.
-> must V : phải làm gì
6. Karachi in Pakistan is the second largest city in the world in population.
-> the second largest : lớn thứ hai