Unit 3 Grammar 语法课件 2023-2024学年沪教牛津版英语八年级上册

Unit 3 Computers Grammar I have been to the Great wall and the Forbidden City. I have visited the Summer Palace and the Temple of Heaven. I have stayed in Beijing for 2 weeks. The present perfect tense 现在完成时态 （一）现在完成时 现在完成时通常用于表示已经完成的而又与现在存在某种联系的动作或事件。 We form the present perfect tense with _____ or _____ + the past participle (过去分词) of the main verb. Work out the rule have has Things to remember I / You / We / They have = I’ve/You’ve/We’ve/They’ve He/She/It has = He’s/She’s/It’s have not = haven’t has not = hasn’t The past participle of a regular verb is usually the same as its past tense. You can find the past participles of some irregular verbs on pages 141 and 142. 【注意】动词过去分词规则变化与不规则变化 (一) 规则变化：与动词过去式规则相同。 (二) 不规则变化：不规则动词的变化因词而异，例如：begin — begun，cost — cost，understand — understood 规则动词的过去分词与过去式的变化规则基本一致： 1) 一般在词尾直接加-ed。eg: look-looked 2) 以e结尾的，直接加-d。eg: move-moved 3) 以“辅音字母+y”结尾的，变y为i，再加-ed。 eg: carry-carried 4) 重读闭音节单词需双写末尾辅音字母，再加-ed。eg: stop-stopped 不规则动词的变化没有规律，则要单独记忆。 see-saw-seen be-was, were-been eat-ate-eaten break-broke-broken go-went-gone take-took-taken send-sent-sent find-found-found make-made-made have-had-had Past Participle the simple present tense the present perfect tense 1 2 3 4 5 6 7 8 9 allow allowed goes gone are been sing sung teach taught bring brought sits sat live lived opens opened Write the words in the present perfect tense. 8 一、请写出下列不规则动词过去式和过去分词。 do ___________ ___________ be ___________ ___________ learn ___________ ___________ keep ___________ _______ teach ___________ ___________ see ___________ ___________ spend___________ ___________ win___________ ___________ have___________ ___________ go___________ ___________ find___________ ___________ run ___________ ___________ make___________ ___________ come___________ ___________ did done was/wer