内容正文:
第四课时 Grammar
◇目标导航◇
类别
课时要点
重点单词
widely adv.普遍地,广泛地
fair n.展销会;集市
重点短语
run out of用完,耗尽
教学重点
1.帮助学生掌握if和unless引导条件状语从句的基本意义、结构及位置。
2.引导学生在阅读、写作和图书活动等真实语境中表达条件及可能产生的结果。
教学难点
准确区分if与unless,掌握“主将从现”规则并正确运用。
◇教学过程◇
Step 1 Leading in
Greet the class and present several sentences from the unit.Ask students to identify the condition and the result.
Step 2 Presentation:Using if
1.Give and analyze some examples in A.Explain that if is used to talk about the result of a possible action or condition.
(1)Guide students to work out the common pattern:the simple present tense in the if⁃clause and will/can/should or another modal verb in the main clause.
(2)Remind students that when the if⁃clause comes first,a comma is usually used after it.
2.Compare examples about reading and writing,and ask students to identify which part states the condition and which part states the result.
Step 3 Practice
1.Work on A1
(1)Ask students to complete the writing tips with the correct verb forms and add should,can or will where necessary.
(2)Check the answers and ask students to explain why the verb in the if⁃clause stays in the simple present tense.
2.Work on A2
Organize students to talk with a partner about a familiar story or writer using if⁃clauses.
Step 4 Presentation:Using unless
1.Present the examples in B and explain that we can use unless to say that something can only happen or be true if something else does not happen or is not true.
2.Explain that an unless⁃clause can come before or after the main clause,and remind students not to add another negative when the meaning is already expressed by unless.
Step 5 Practice
1.Work on B1:Ask students to rewrite the six sentences about reading and writing poetry using unless.Check together.
2.Work on B2:Let students match the sentence halves.Check together.
3.Work on B3
(1)Ask students to complete the conversation about the Sunshine Book Fair with if or unless.
(2)Invite some pairs to role⁃play the conversation.Check together.
4.Work on B4:Invite students to write a short introduction to a book or writer using at least one if⁃clause and one unless⁃clause.Then share.
Step 6 Summary and Homework
1.Summarize the key meanings:if—on the condition that something happens;unless—if something does not happen.
2.Review the tense pattern and sentence position.
3.Assign contextualized practice:write six sentences about reading,books or writing,using both if and unless correctly.
◇教学反思◇
本课时在阅读与写作语境中比较if和unless。学生容易机械地把unless理解为“if not”,在改写时出现重复否定,也可能在if从句中误用will。后续应加强训练。
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