Unit 3 Fit for life Grammar and usage 课件-2021-2022学年牛津译林版（2020）高中英语选择性必修第二册

Unit 3 Fit for life Grammar and usage The present perfect continuous tense 现在完成进行时 现在完成进行时是现在完成时态与进行时态的结合，既有现在完成时态的特点，也有进行时态的特点。 Step 1 Lead-in Eg: It has been raining these days. We have been studying in the school for three years. have/has been doing Step 2 Exploring the rules Below is a personal account given by a girl who is equipped with a robotic hand. Find the sentences that use the present perfect continuous tense and fill in the box below. The first one has been done for you. Scientists have been making great progress in robotic technology in recent years, … Over the past three months I have been testing out the limits of what I can do with my new hand, … …, I have been cooking for my family again since I got my new hand. Sentences use the present perfect continuous tense: Working out the rules We use the present perfect continuous tense to talk about an action that started in the past and is still continuing now, or an action that has just finished but is still co