I/

1. would visit (Đây là câu gián tiếp, có the next day: ngày tiếp theo → thì TLĐ ⇒ visit →would visit)

2. had (Đây là câu ước ko có thật ở HT ⇒ have →had)

3. to buy ( I don't know where to buy the tickets: tôi ko biết nơi nào để mua những chiếc vé này)

4. would do (Đây là câu gián tiếp, có then: sau đó → thì TL trong QK ⇒ do →would do)

II/

1. My father was used to play chess with his close friends when he lived in the countryside.

      be used to V: có thói quen làm j trong QK

2. Did Nga used to get up early when she was a young girl.

    be used to V: có thói quen làm j trong QK , get up : thức dậy

3. There didn't use to be any post office  in my neighborhood.

     be used to V: có thói quen làm j trong QK , get up : thức dậy

4. Nam wishes he would be a famous doctor in the future.

     câu ước trong tương lai : S+ wishes + would V nguyên : ước sẽ làm j trong tương lai

5. I wish there were a big river in front of my house.

    câu ước ko có thật ở HT : S+ were+ ........

6. Hoa wishes she could speak English naturally and fluently.

  câu ước ko có thật ở HT :S+ V chia QKĐ+.....

I 1.would visit 2.had had 3.to buy 4.was doing II 1.My father used to play chess with his close friends when he lived in the countryside 2.Did Nga use to get up early when she was a young girl? 3.There didn’t use to be a post office in my neighborhood 4.Nam wishes he would be a famous doctor in the future 5.I wish there was a big river in front of my house 6.Hoa wishes I could speak English naturally and fluently