How long have you been collecting shells教案

八年級下英語學案第31課時
【課題】：unit 6 how long have you been collecting shells? . section a (1a-2c)
【勵志小木屋】：good habits are the best friends of man. 良好的習慣是益友
【學習目標】：
知識目標  1.識記并會運用單詞collect, shell, pair, skate, since
2.理解并運用短語 for five years, a pair of...
3. 掌握并運用句型(1) --- how long have you been skating ?
                    --- i have been skating for five hours.
         (2) --- how long have you been skating ?
            --- i have been skating since i was seven years old.
能力目標：能用新句型進行對話，了解完成時態的用法。
情感目標：培養學生們的交際能力，以及相互幫助和合作的能力。
【學習重難點】：重點：現在完成時態的構成及用法，標志詞.
難點：have /has been and have/has gone 的區別.
一、自主預習
（一） 預習任務
task one  預習本單元的單詞  1）個人自讀，記憶本課單詞2）小組互相檢查單詞讀的情況
收集_______ 貝殼________ 一雙 __________溜冰鞋__________  自從_____馬拉松賽跑 ____________ 一雙溜冰鞋 ____________ 在馬拉松賽中  _______
task two：自主預習1b,2a,2b的聽力
1.試譯以下句子i’ve been skating for five hours.______________
i skated for four hours.________________________
2. 以上兩個句子有什么區別_________________
3.拓展練習 a. 自從八點開始，我就已經滑冰了。__________________________
b. 我讀過這本書._________________
c. 我收集貝殼已經兩年了。_____________________________
task three ：how 的相關詞組:
how________多少（錢）　  how _______多少(人)    how________多遠　         how ________多久一次     how_______多大        how ________ 多久以后
（二）預習診斷. 從b欄中找出a欄相應的答語
a
1. how long has alison been skating?
2. how long did sam skate?
3. was this your first skating marathon ?
4. do you skate every day ?
5. when did you get your first pair of skates ?
b
a . yes , i do.
b . no, iskated in a marathon last year.
c . she has been skating for five hours.
d . on my tenth birthday.
e . he skated for four hours.
（三）預習反思 do you have any questions ?
二.課中實施
step 1  預習交流------精講點撥
1. --- how long have you been collecting shells?
--- i have been skating since i was seven years old.
(1) how long意為“多長時間”，對時間段提問，常用for+時間段或since ... 等表示一段時間的短語回答，for+時間段== since+時間段+ago 。例如：