I'm writing to express my complaint about the service of Cloud Travel Agency.I'm writing是主句.to express my complaint是表目的状语.about the service of Cloud Travel Agency是修饰complaint的成分...
i'm writing to是我写这封信是为了..... express my complaint about是关于.....表达我的抱怨/表达对.....的抱怨 the service of Cloud Travel Agency是旅行社的服务 合在一起是我写这封信是为了表达我对旅行社服务的抱怨。writing 和 to express 都是非谓吗?writing是动词的...