15. Digital life - 16. Amazing science - REVIEW 4 » Стр.88 (1)

Grammar 1. Read and complete the rules with the words in the box. a. We use the passive when the person or thing that causes the action is unknown or unimportant. b. We form the present simple passive with the correct form of be and the past partciple of the verb. c. When we include who or what did the action, we use by.