unit 13 we’re trying to save the earth（第2課時(shí)）教案-預(yù)覽頁(yè)
【正文】 was considered the nicest river in the town. 4. The air has bee really polluted.\ 5. We should help savew the sharks. Answers: 1. 現(xiàn)在進(jìn)行時(shí) 2. used to 3. 一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài) 4. 現(xiàn)在完成時(shí) 5. should 課堂講授 Step 2. Presentation 1) Review different forms of verb ask 現(xiàn)在時(shí) 過(guò)去時(shí) 將來(lái)時(shí) 過(guò)去將來(lái)時(shí) 一般 主動(dòng)語(yǔ)態(tài) ask / asks asked shall/will ask should/would ask 被動(dòng)語(yǔ)態(tài) am/is/are asked was/were asked shall/will be asked should/would be asked 進(jìn)行 主動(dòng)語(yǔ)態(tài) am/is/are asking was/were asking 被動(dòng)語(yǔ)態(tài) 完成 主動(dòng)語(yǔ)態(tài) have/has asked had asked 被動(dòng)語(yǔ)態(tài) have/has been asked had been asked 2) Review Modal verbs. Main function of Modal Verbs. ① . can (could) 表示能力， could主要指過(guò)去時(shí)間；表示允許。本單元主要復(fù)習(xí)語(yǔ)法內(nèi)容為情態(tài)動(dòng)詞和動(dòng)詞形式變化。并且教給大家如何保護(hù)瀕危動(dòng)物，如何通過(guò)回收利用等方式來(lái)保護(hù)地球。 三、 教學(xué)準(zhǔn)備 ppt， recorder， mutiplemedia 四、 教學(xué)環(huán)節(jié) 課堂導(dǎo)入 Step 1 Leadin 判斷下列句子中使用了什么時(shí)態(tài)及情態(tài)動(dòng)詞。意為 “ 必須 ” （主觀意志） ④ . shall 表征詢意見(jiàn) ⑤ . will 表意愿，用于各種人稱陳述句；表請(qǐng)求，用于疑問(wèn) 句。 ③ . must 表示義
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