Jawaban:

1.) The project will have been completed before the deadline.

2.) People who were passing by were being questioned by the police when the store was entered by robbers.

Penjelasan:

1.) The sentence is in the future perfect tense, which is formed using "will have" + past participle. To change it into passive voice, we move the object ("the project") to the beginning of the sentence and add "been" after the auxiliary verb "have". Finally, we add the past participle of the main verb ("completed").

2.) The sentence is in the past continuous tense, which is formed using "was/were + present participle (-ing)". To change it into passive voice, we move the object ("people") to the beginning of the sentence and add "being" after the auxiliary verb "were". Then, we add the past participle of the main verb ("questioned"). The subject ("police") becomes the agent of the passive voice and is added with "by" after the main verb. Finally, we change the verb "entered" into the past participle "been entered" to complete the passive voice.