1 i started doing voluntary work three years ago

-> started + V-ing

2 I spent two hours walking to her village

-> spend time + V-ing

3 the nile is the longest river in the word

-> so sánh nhất :

->  1 âm tiết : adj + est

-> 2 âm tiết : the most + adj

4 HCM musuem was visited by millions of tourist this morning

-> câu bị động thfi QKĐ : s + wa s/ were + VPII + by + O

5 Because of the boring film,l fell asleep

II

1 driving in the city is much more stressful than driving in the countryside

-> much more + adj / adv

2 we have known each other since we were ten years old

-> thì HTHt + since +  s+ have / has + vPII + since + mốc thơi gian

3 I enjoyed meeting  him last week in the library

-> enjoyed + V-ing

4 which ethnic group has the largest population in vietnam

-> so sánh nhất

-> 1 âm tiết : adj + est

the mots + adj