1.Model A:
![](//static.xuejinqu.com/qimg/565/56566165f51270e5f1af754e5f0540d1.png)
—What are you going to do today?
—I’m going to play baseball.
![](//static.xuejinqu.com/qimg/5cb/5cbb663028a62f46cf904d435cd75788.png)
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___________________________________________2.Model B:
![](//static.xuejinqu.com/qimg/6f9/6f9265f6eb8bad4fb00524b47d892164.png)
—Are you going to sweep the floor?
—No, I’m not. I’m going to write a letter.
![](//static.xuejinqu.com/qimg/f85/f8509721d9b599ed467e2752adb576aa.png)
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___________________________________________3.Model C:
![](//static.xuejinqu.com/qimg/8c3/8c382bc76b4689c7406893d5ed171c35.png)
—Are they going to play football this Sunday?
—Yes, they are.
![](//static.xuejinqu.com/qimg/1eb/1eba6f1ca364f5d3d47c47838885a153.png)
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