【省略to的不定式变成被动语态还原to】的例()子

常用的使役动词 make （let, have ）sb do sth 以及感官动词 see （hear ,watch ,listen to ）sb do sth ,改为被动语态时都要还原 to .例如：1.We often see him play football .---He is often seen to play footba...