1 he adores playing chess with his sister => he is .......... 2 "i will hand in my assignment to the teacher tomorrow " .she said => she said......... 3 radioactive pollution is very dangerous. It can cause abnormal growth => since............. 4 they built that school two years ago => that school.......... 5 how long has she learnt english ? => when.......

`1` He adores playing chess with his sister

`->` He is interested in playing chess with his sister.

Cấu trúc: $be$ $interested$ $in + Ving$: hứng thú $= adore + Ving$: yêu thích

`2.` "I will hand in my assignment to the teacher tomorrow ". She said

`->` She said she would hand in her assignment to the teacher the day after.

`3.` Radioactive pollution is very dangerous. It can cause abnormal growth.

`->` Since radioactive pollution cause abnormal growth, it is very dangerous.

`-` Since = Because: Bởi vì

`-` Since + Clause, clause

`-` Dịch: Vì ô nhiễm phóng xạ gây ra sự phát triển bất thường nên rất nguy hiểm.

`4.` They built that school two years ago

`->` That school was built two years ago.

`-` `DHNB`: ago `->` Thì quá khứ đơn

`-` Cấu trúc bị động

$(+) S + were/was + V3$

`-` "That school" là ngôi số ít nên to be là "was"

`5.` How long has she learnt English ?

`->` When did she start learning English?

`-` How long: bao lâu

`-` When: Khi nào

`-` start + Ving: bắt đầu