下面就是新东方在线雅思频道为大家收集整理的雅思写作语法错误解析(5)：双谓语，供大家参考。更多雅思报名官网的最新消息，最新、最专业的雅思备考资料，新东方在线雅思频道将第一时间为大家发布。

　　确保一句中有且仅有一个谓语动词

　　错例：It is unclear recycling can control pollution.

　　正解：It is unclear whether recycling can control pollution.

　　改错练习：

　　1. It is advertising makes us buy something impulsively.

　　2. There are two line charts show the unemployment rate fluctuates in China.

　　3. The percentage of families have one car increased greatly.