你所指的结构助词是语法助词。助词，顾名思义，指的是帮助构成某种语法现象，比如帮助构成疑问句，否定句，时态，语态，强调结构等。常见助词有be动词，am is are was were do does didhas have hadshall will should would 等。
be动词帮助构成进行时，被动语态do的各种形式构成问句及强调结构have的各种形式构成完成时will的各种形式构成将来时。希望有帮助
