![]() ![]() ![]() The new smoke alarm was installed yesterday by the company director herself. Most of the time, the agent is not mentioned, but if important, the agent can be mentioned using the preposition by. The 'doer' of the action is called the agent. The new smoke alarm was installed yesterday. The most common way to form the passive is subject + be + past participle. when we prefer not to mention who or what does the action (for example, it's not known, it's obvious or we don't want to say).so that we can start a sentence with the most important or most logical information.We can use the passive voice to change the focus of the sentence. Grammar test 1Ĭ1: Advanced passives: 1 Grammar explanation Look at these examples to see how the passive voice is used.Ĭleaner sources of energy must be developed.Īn electrical fault is believed to have caused the power cut.
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