Period 3 Grammar in Use（同步课件+分层练习）英语沪外版2020选择性必修第一册

Unit 3 Adventuring Period 3 Grammar in Use Past Perfect usually indicates: a finished action before some point in the past; an action that began in the past and continued up to another action point in the past, and its consequences have impact on the second point in time. Form: Subject + had + -ed Shackleton and his men’s expedition explorers had never crossed South Georgia It is said that explorers had never crossed South Georgia on foot before Shackleton and his men’s expedition. the crew were making efforts the ice melted and the ship suddenly broke in half Past Continuous usually indicates: an ongoing action at a particular time in the past; a longer action in the past was interrupted by a shorter action. Form: Subject + was/were + doing The crew were making a lot of efforts to solve the problem when the ice melted and the ship suddenly broke in half. Form Use Meaning Past Perfect Passive’s Form: Subject + had been + -ed (+ by agent) The second sentence: focuses on the object affected by an action retains more objectivity It is said that explorers had never crossed South Georgia on foot before Shackleton and his men’s expedition. had never been crossed It is said that South Georgia by explorers on foot before Shackleton and his men’s expedition. Past Continuous Passive’s Form: Subject + was/were being + -ed (+ by agent) Form Use Meaning People were making a lot of efforts to solve the problem when the ice melted and the ship suddenly broke in half. • A lot of efforts were being made by people to solve the problem when the ice melted and the ship suddenly broke in half. The second sentence: focuses on the object affected by an action retains more objectivity black cliffs of South Georgia were in sight was running very low had been hit was being filled with were now using had met was being tortured had been brought (on May 8th ) saw two shags got a glimpse of the sun boat had been hit by waves Our boat (1) B by several enormous waves before the weather got bet