1.本课课程的核心句是Could he answer all the questions? Yes, he could. They are easy enough for him to answer. Could he answer all the question? No, he couldn't. They were to difficult for him to answer. Could he answer all the questions? Yes, he could. He is clever enough to answer.
2.本课课程的核心句是Could he answer all the questions? No, he couldn't. He is too stupid to answer. Could he buy the car? Yes, he could. It was cheap enough for him to buy. Could he buy the car? No, he couldn't. It was too expensive for him to buy.
3.本课课程的核心句是Could they eat the cakes? Yes, they could. The cakes were fresh enough for them to eat. Yes, they could. The cakes were fresh enough for them to eat. Could they eat the cakes? No, they couldn't. The cakes are too stale for them to eat. Could they hear the stereo? Yes, they could. It was loud enough for them to hear.
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