... the subject of the sentence is the agent, the person who has to do the job, then we use the active infinitive, not the passive.If the subject of the sentence is not the agent, then we use the ... passive infinitive. - These windows have to be painted. - The homework was to be done by the next day. - After the subject there, we can use either an active or a passive infinitive. - There ... something to read on the train. (= something that you can read) - The doctor had a number of patients to see. The to -infinitive clause here is shorter and neater than the finite clause with have to...