Đáp án + Giải thích các bước giải:

`16`. Minh said that those were his pens.

`17`. Tom said that he had to do his homework every day.

`18`. She said that her brother could play the piano.

`19`. Marry said that they might visit London the following month.

`20`. Peter said that his family sometimes went camping in the mountains.

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`@` Câu trần thuật, câu kể 

S + say(s) / said + (that) + S + V 

`@` Câu hỏi Yes/No Question

S + asked / wanted to know / wondered + if / whether + S + V

`@`  Câu hỏi Wh-question

S + asked (+O) / wanted to know / wondered + Wh-words + S + V

CHÚC BẠN HỌC TỐT!~

`\color{#145277}{N}\color{#246483}{a}\color{#34768F} {e}\color{#44889B}{u}\color{#539AA7}{n}`

`@` CT : Câu mệnh lệnh 

`=>` S + asked / told + O + to -V / not to - V

`***` asked / told `=` advised `=` invited `=` warned `=` ordered `=` reminded `=` offered

`@` Câu tường thuật : S + said that + S' + V(past form).

`@` Câu hỏi : S + asked + O + IF / WHETHER + S' + V(lùi thì)

`@` Câu hỏi : S + asked + O + WH-word + S' + V(lùi thì)

`--------------`

`16.` Minh said those were his pens.

`17.` Tom said he had to do his homework everyday.

`18.` She said her brother could play the piano.

`19.` Marry said they might visit London the following month.

`-` Next month `=>` the following month.

`20.` Peter said his family sometimes went camping in the mountain.