Here it is a resource I have designed for my students to practive passive sentences, with three different activities:
1- In activity 1 students have to read some sentences, underline the verb or verbs in each sentence and then indicate whether the verb is active or passive and also which verb tense is being used.
2- In activity 2 students have to change the active sentences to passive.
3- In activity 3 students have to transform the following active sentences into the passive voice
Hope you find it useful !!
(Answer key is provided)