助动词没有意义,是用来帮助形成时态、语态、加强语气、帮助形成否定和疑问的,有这些功能的都是助动词：be(用于进行时态和被动语态）； has/have/had(用于完成时态）；do(用于加强语气和帮助形成一般时态的否定和疑问); will/shall/would(用于将来时态)
He has been here for 2 hours.
There's going to be a football match tomorrow.
He would be a VIP now if he had worked hard in his youth.