when everyone is because see you smile这句话的语法对不对be动词或不是ing吗,为什么see用原形?

Everyone is happy when the class is o___ BEC口语：what is important when producing a market plan? Everyone is happy when you do good for others. Everyone is?everyone are? everyone is everyone 是什么意思 “Everyone is everyone are还是everyone is not every is everyone everyone 翻译下列句子： Everyone is happy when you do something good for others. 时间不等人! 翻译下列句子：everyone is happy when you do something good for others. We hope everyone should make contributions to our country especially when she is in d is the world perfect only when everyone has found the special one的中文意思? when it comes ,everyone is very happy .the family m____ get together on that day . everyone is much quieter than usual when taking a test为什么用taking? Everyone is living Everyone is living masten Everyone is here Everyone is enjoying themselves Everyone is playing happily