Unit 6 When was it invented Grammar Focus Class TypeGrammar Objectives1. To learn and understand the “passive voice in the past tense”.2. To better understand and well use the passive voice in the past tense in practice.Key structure1. When wad the zipper invented? It was invented in 1893.2. Who was it invented by? It was invented by 3. What is the hot ice-cream scoop used for? Its used for serving really cold ice-cream.DifficultiesHow to well use the structure about passive voice in the past tense in practice.Period1ProcedureLead-inShow Ss the basic form of passive voice in different tenses.Step 1Examples of active voice sentences and passive voice sentences. Step 2Explanation about the exchanges of active voice sentences and passive voice sentences.Step 3The four steps that the exchanges of active voice sentences and passive voice sentences should obey.Step 4The sentence structures of passive voice sentences with examples.Step 5The use of passive voice with specific examples sentences.Step 6Ask Ss to read the sentences with the passive voice parts underlined.Step 7Show Ss some example sentences in different tenses Step 8More exercises.1. Change the active sentences into passive sentences.2. Complete sentences with the correct words.3. Choose the best answer.Step 9Activity 4a.Ask Ss to rewrite the sentences using the passive voice.Step 10Activity 4b.Ask Ss to complete the sentences with the correct forms of the verbs in the box.Step 11Activity 4c.Let Ss write the correct forms in the blanks.Step 12ExercisesofSecondary SchoolEntranceExams2