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1. action(n): hành động

Đặt câu:

- It’s time the government acted to lower taxes.

- The firemen are ready to go into action.

- At seventy, he’s no longer very active.

- You’re overweight because you’re so inactive.

- The actors are able to reach a common agreement on their preferences and are open to ties with other parties.

- She's the highest-paid actress in Hollywood.

2. 

- She has the build of an athlete.

- She looks very athletic.

- Girls who participate in high school athletics are more likely to graduate than those who don’t.

3. child(n): trẻ con

childlike(adj): trẻ thơ

childish(adj): ấu trĩ

Đặt câu:

- As a child, I didn't eat vegetables.

- I have many children.

- She had an unhappy childhood.

- All her life she had a childlike trust in other people.

- She said we should be ashamed of our childish behaviour – fighting over who got the last strawberry.

4. collect(adv): sưu tập

collective(adj): tập thể

Đặt câu:

- She collects dolls.

- We're having a collection for Tom's retirement present.

- An avid art collector, he owned at least a dozen Picassos.

- It was a collective decision.