Unit 1 Tales of the unexplained---Grammar and usage现在完成时和现在完成进行时课件

课件69张PPT。英语课件牛津版 高一 模块二 Unit 1Present perfect tense & Present perfect continuous tense Lead-inLook at the following sentences and try to explain why the tense is used in these sentences.1. We have studied English for about five years. 2. They have lived there since 1990. 3. She hasn’t finished her homework yet. 4. Eric has just come back. 5. How long have you been here?1.The form of the Present perfect tense:We form the present perfect tense with have/has and the past participle of the verb. have (has) +过去分词Justin has disappeared, so Kelly is very sad.We use the present perfect tense to talk about things that happened in the recent past, but are connected to the present.Note:2. The uses of the present perfect tense:I have not seen Justin since last Friday night.We also use the present perfect tense to talk about something that started in the past and is still happening now.Note :I haven’t seen your for ages. He has just gone out. It has been very cold lately. She has already finished her homework. He hasn’t seen her since the meeting. Note: We use the present perfect tense when the exact time of an action is not clear or important.We use it with time expressions such as: already ever for just lately never recently since yet We use already for affirmative statements, yet for negative statements. We use for + a period of time, since + a point in time. Note: We use the present perfect tense to talk about actions that were completed only a short time ago. He has just gone out.(= He went out a few minutes ago.) I have just heard the news. (= Now I know the news.)Note: We can also use the present perfect tense for repeated actions, that is, we use the present perfect tense with the time expressions once/twice/three times…They say that they have been to America many times.Look at the sentences and find the difference:Tom has rung up three times this morning.Now it is still in the morning.Tom rang up three times this morning.Now it is not still in the morning.Actions occurring in an incomplete period might be indicated by today or this morning/afternoon/ evening/ week/ month/ year/ century or all day/night/week, all the time, always etc.Note:Point out what tense or tenses are used in the sentences and the reasons why they are used. 1. We have studied English for about five years. We began to study it five years ago. 2. They moved to the south in 1990 and have lived there since then.3. Eric left home last year and has just come back. 4. They bought this house three years ago and they have lived here since then. 5. My brother went to see my grandpa last week. He has visited him three times this month.1 ‘_____ you _____ my pen?’ ‘Yes, I____ it on your desk just now.’ (see) 2 ‘_____ you ____ dinner?’ ‘Yes, I ____ it with Mary.’ (have) 3 _____the postman_____ yet this morning? ____ the postman_____ this morning? (come)HaveHavehadDidHasComplete the sentences.seencomecomehadsawe.g.Bill has smoked since he left school.He still smo ... ...