Read each sentence, then decided whether it seems like a topic sentence or a supporting sentence.

Topic sentences:

1. Building a birdhouse can be lots of fun.

2. Our PE teacher is really tough sometimes.

Supporting sentences:

1. When you paint it, you can go wild with the colors.

Friends can work together on planning and building the birdhouse.

2. Once we had to run in the rain!

She blows the whistle really loudly.

We have to run lots and lots of laps.

Explanation:

The topic sentence is the sentence that summarizes the information in the paragraph. It's usually the first sentence of the paragraph.

Supporting sentences contain details about what is stated in the topic sentence.

We can divide the given sentences into two groups (or paragraphs). One group tells about the process of building a birdhouse, and the other about a strict PE teacher. Both of these paragraphs have to have their topic sentence, so there are two topic sentences:

The rest of the sentences are supporting.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.