REWRITE

`16`.We started to learn English `10` years ago

`->` S + started / began + V-ing / to V + time / timeline : Bắt đầu làm gì ( `16 , 20` )

`17`.The last time we met was a long time ago

`->` The last time + S + Ved / V2 + was + time / timeline 

`=>` Lần cuối làm gì

`18`.Ms.Ann last took part in many voluntary programs `4` years ago

`->` S + last + Ved / V2 + time / timeline 

`=>` Lần cuối làm gì

`19`.It is Christmas since I last met my family

`->` It + is / has been + time / timeline + since + S + last + Ved / V2

`=>` Đã bao lâu kể từ khi lần cuối làm gì

`20`.When did you start to live here ?

`->` When + did + S + V ?

`=>` Đã làm từ khi nào ?

`\text{# TF}`