1. I used to go swimming in the river when I was a boy.

-> Used to + V1 : đã từng làm gì trong quá khứ

2. I haven't seen my grandma for 5 months

-> It's + time + since + S + last + V2/ed

= S + have/has + not + V3/ed + for time

3. My little brother is interested in carving egg shells in his free time.

-> be interested in doing sth = quan tâm đến việc làm gì đó, có hứng thú với việc gì đó (đề cập đến một hành động chung).

4. English has been studying English since we were in primary school.

-> S + started + Ving + when time

= S + have/has + been + Ving + since time

5. The more you practice speaking English regularly, the more your English will be better

-> The more adv + S + V, the more + adv + S + V

1. I often went swimming in the river when I was a boy.

→ I used to go swimming in the river when I was a boy.

(S + used to + V)

2. It is 5 months since I last saw my grandma.

→ I haven't seen my grandma for 5 months.

(S + have/ has (not) + V3/ed + for + time)

3. My little brother enjoys carving eggshells in his free time.

→ My little brother is enjoyable carving eggshells in his free time.

( S + be + enjoyable + noun)

4. We started studying English when we were in primary school.

→ English has been studied when we were in primary school.

(S + have/ has (not) + V3/ed + for + time)

5. If you practice speaking English more regularly, your English will be better.

→ The more regularly you practice speaking English, the more fluently you can speak it.

(The more adv + S + V, the more + adv + S + V)