確保一句中有且僅有一個(gè)謂語動(dòng)詞
錯(cuò)例：It is unclear recycling can control pollution.
正解：It is unclear whether recycling can control pollution.
改錯(cuò)練習(xí)：
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.
錯(cuò)例：It is unclear recycling can control pollution.
正解：It is unclear whether recycling can control pollution.
改錯(cuò)練習(xí)：
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.