`1`.Peter said that he had to go to school then

`\rightarrow` Câu tường thuật : S + said + that + S + V ( lùi thì )

`\rightarrow` must `->` had to

`2`.Many lakes and rivers have been destroyed by waste from the factories

`\rightarrow` BĐ `-` Thì HTHT : S + have / has + been + V3 / PII ( by O )

`3`.He told me that he didn't know what Lan was doing

`\rightarrow` Câu tường thuật : S + said to / told + O + that + S + V ( lùi thì )

`\rightarrow` HTĐ `->` QKĐ : S + Ved / V2

`\rightarrow` HTTD `->` QKTD : S + was / were + V-ing

`\text{# Kirigiri}`

1. Peter said that he must go to school then

cấu trúc: S + say(s)/said + (that) + S + V

2. Many lakes and rivers has been destroyed by waste from the factories

bị động với hiện tại hoàn thành: has/have +been +Vpp2

3. He told that he didn't what Lan was doing

cấu trúc: S + told + (that) + S + V