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【答案】
1. How many faces can you see?
2. Are there many students doing homework?
3. There isn’t one on the floor.
4. The painting class begins, please give out the crayons.
5. 有21支蜡笔。
【解析】
1. “twenty”表示数量,所以用“how many”提问。
2. 一般现在时的句子改为一般疑问句时只需将谓语are提到句首。
3. 一般现在时的句子改为否定句只需借助not即可。
4. The painting class begins, please give out the crayons.
5. “ There are twenty–one crayons.”是“有21支蜡笔”的意思。