How many pencils do you have?

你有多少支铅笔？

同一单元的其他句子

• I want to buy a new dress.我想买一条新裙子。
• How much is this toy car?这个玩具车多少钱？
• Can I help you?我能帮你吗？
• The apples are two yuan each.苹果每个两元。
• Do you have any milk?你们有牛奶吗？