Please help me to better understand how to construct sentences using causative verbs in the passive voice. For example: What is the passive form of this sentence: "He let her show him the book." ? I can understand the differences between these two: What do you need to do after class (causative, right?) and What do you need to have done after class (passive causative, right?) Or better yet: What do you want to do with this? versus What do you want to have done with this? With causative verbs such as let, have, get, make, the construct is this: SUB. + Causative TV + Dir.OB. + participial verb. "She gets her car washed on Fridays." Now how do you put this into passive causative? And what form of the verb is used with LET? Is LET always followed by the base form of the verb in the causative? Even if it is passive causative? Confused!