要求某人采取行动：
　　We must insist that ...DO... (DO指动词原型)
　　注：请注意这一句型和句型8的区别。
　　环境：
　　We must insist that you deliver the goods immediately.
　　警告：
　　Unless...
　　If...(not)... We will be forced to ...
　　环境： (What warnings would you give these people?)
　　A company that has not paid your bill
　　Unless you pay the bill, we will be forced to take legal actions.
　　Another company that is using your company's car park
　　If you do not move your car away from our park, we will be forced to turn to the police.
　　An employee who always arrives late for work
　　Unless you come to work on time, we will be forced to fire you.
　　A builder who has left a lot of their tools in your office
　　If you do not take your tools from our office, we will be forced to throw them away.
　　强烈抱怨：
　　注：
　　强烈抱怨遵循以下步骤：
　　a. 阐述发生的问题：it is now over nine months since we placed this order and we are still waiting for the cabinets.
　　b. 使用句型12：I should like to point out that we have already paid for these cabinets.
　　c. 使用句型 13：we must insist that you deliver them immediately.
　　d. 使用句型14：unless we hear from you within 7 days we will take legal action.