1. My father is a hard worker.

• "Hard" is an adjective that describes someone who puts in a lot of effort at work.

2. Lan works hard.

• Similar to the previous sentence, "hard" describes the effort Lan puts into her work.

3. She is a good student in my class.

• "Good" is an adjective that describes someone who performs well academically.

4. She studies well.

• "Well" is an adverb that describes how well she studies. "Good" can also be used here, but "well" emphasizes the manner of studying.

5. My father drives very fast.

• "Fast" is an adjective that describes speed.

6. The weather on earth is becoming worse.

• "Worse" is the comparative form of the adjective "bad." It describes a negative change.

7. I found the movie boring.

• "Boring" is an adjective that describes something uninteresting.

8. This orange tastes sweet.

• "Sweet" is an adjective that describes the flavor of the orange.

9. When you are in the swimming pool, play safely and listen to the pool lifeguard carefully.

• "Safely" is an adverb that describes how you should play. "Carefully" is an adverb that describes how you should listen.

10. I'm pleased that you and your family are well.

• "Well" is an adjective used in this context to express that you and your family are healthy and doing well.

11. My mother plays volleyball skillfully.

• "Skillfully" is an adverb that describes how well your mother plays volleyball.