被动语态by后面做什么语Wecan’tlaughhim.→Hecan’tbelaughbyus.byus是什么成分?
随意找三句被动语态
Wecan’tlaughhim.→Hecan’tbelaughbyus.
Helistenstotheradioeveryday.→Theradioislistenedtotobyhimeveryday.
Thenurseistakingcareofthesickman.→Thesickmanisbeingtakencareofbythenurse.
byus,byhim,bythenurse在句中做什么成分?为什么?