`color{red}{~Answer~}`

`10`. Minh suggested visiting the countryside that weekend.

S + suggested + V-ing: đề nghị 

`11`. The old man asked the boy if he could help him with his luggage.

S + asked + O + if/whether + S+ V (lùi thì)

could → could 

`12`. She said that she was reading a book then.

S + said (that) + S + V (lùi thì)

Hiện tại tiếp diễn (am/is/are + V-ing) → Quá khứ tiếp diễn (was/were + V-ing)

now → then 

`13`. He asked me if I was free that night.

S + asked + O + if/whether + S+ V (lùi thì)

Hiện tại đơn (am/is/are) → Quá khứ đơn (was/were)

tonight → that night 

`14`. Mary asked Peter where he lived.

S + asked + O + Wh+ S+ V (lùi thì)

Hiện tại đơn (V-bare/s/es) → Quá khứ đơn (V2-ed) 

`15`. They said that they were going to travel to Ha Noi with their uncle the next month.

S + said (that) + S + V (lùi thì)

Tương lai gần (am/is/are + going to + V-bare) → was/were + going to + V-bare

next month → the next month / the following month 

`color{blue}{~Jimin~}`