`1`.I started doing voluntary work three years ago

`\rightarrow` Cấu trúc : S + started / began + V-ing / to V

`2`.We don't have to change the dates of our trip

`\rightarrow` S + have / has / ... + to V : Bắt buộc làm điều gì đó

`3`.Would you like me to show you how to use this ?

`\rightarrow` Would you like + to do sth ? : Muốn làm gì

`4`.The Museum of Ethnology is visited by millions of tourists every year

`\rightarrow` Câu bị động `-` Thì HTĐ : S + be + V3 / PII ( by O )

`\text{@ TheFox}`

1. I have done voluntany work for three years.

$⇒$ I started doing voluntary work three years ago.

2. It't not necessary to change the dates of out trip

$⇒$ We don't have to change the dates of our trip.

3. Do you want me to show you how to use this ?

$⇒$ Would you like me to show you how to use this?
4. Million of tourists visit the Museum of Ethnology every year.

$⇒$ The Museum of Ethnology is visited by millions of tourists every year.