They had been invited to a Hindu wedding and were not sure what happened on such occasions.请问老师（1）what引导的是什么从句？（2）on such occasions是时间状语还是地址状语，另外具体是哪种状语是靠语义区别的吗？
1 what从句为修饰表语形容词的补足语。
2 on介词短语为时间状语。
3 状语的分类自然是依据语义分类。
They had been invited to a Hindu wedding and were not sure what happened on such occasions.请问老师（1）what引导的是什么从句？（2）on such occasions是时间状语还是地址状语，另外具体是哪种状语是靠语义区别的吗？
1 what从句为修饰表语形容词的补足语。
2 on介词短语为时间状语。
3 状语的分类自然是依据语义分类。