To 语者, 

Common mistake - fall

Common mistake - experience

Common mistake - can, could or may

Common mistake - equipment

Common mistake - enjoy

Common mistake - elder or elderly

Common mistake - although or though

Common mistake - almost or nearly

Common mistake - Above or over

Common mistake - economic/economical

Common mistake - drop

Common mistake - discuss

Common mistake - difficult

Common mistake - difference/different

Common mistake - decrease

Common mistake - day

Common mistake - damage

Common mistake - contact

Common mistake - consider

Common mistake - concern/concerned/concerning