1.1. In their free time./ do / that / should / teenagers / sports / I believe / a lot of

⇒⇒ I believe a lot of teenagers should do sports in their free time.

−- S + believe (that) + MĐ : ai đó tin rằng

−- S + should + V-inf : ai đó nên làm gì

−- a lot of + N nhiều : nhiều

2.2. almost anywhere./ the most popular / because it / soccer / can easily / is considered / team sport / be played

⇒⇒ The most popular team sport is considered soccer because it can easily be played almost anywhere.

−- Because + MĐ nguyên nhân : bởi vì

−- Bị động : S + can be P2 : có thể được làm gì 

3.3. and the national one. / are rushing/ thousands of people/ watch / between the city's team / to the stadium/ the match / in order to

⇒⇒ Thousands of people are rushing to the stadium in order to watch the match between the city's team and the national one. 

−- Thì HTTD : S + am/is/are + V-ing + .....

−- in order to + V-inf: để mà

−- between sth and sth: giữa sth và sth

4.4. either / or / Mom said / could / stay home / that / to go to / the concert / playing video games / we

⇒⇒ Mom said that we could either stay home playing video games or go to the concert.

−- could + V-inf : có thể làm gì