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小学英语人教精通版五年级下册Lesson 3教课内容ppt课件
展开Ask and answerquestins actively.
Dn't make nise.
Dn't eat in class.
它是英语中的一个句式,也是用于表达命令、请求、劝告、警告、禁止等的句子。因此也常称为命令句。
祈使句(Imperative Sentence)
Observe(观察)
Turn right!
Dn't est in class.
Dn’t park yur car!
Dn’t pick the flwers!
Ask and answer questins actively.
无主语, 动词原形 把头开!
肯定结构: (Psitive frms)•1. D型 •e.g:Please turn left!.=Turn left!, please.••2. Be型 •e.g Be a gd by! •3. Let型•e.g Let chant. Let sing a sng.
否定结构: (Negative frms)•1. D型和Be型的否定式都是在句首加dn’t构成。 •Dn't be late fr schl! Dn't make nise. Dn't est in class.•2. Let型的否定式有两种:•①“Dn‘t + let + 宾语 + 动词原形 + 其它成分”•②“Let + 宾语 + nt + 动词原形 + 其它成分”。•e.g Dn’t let him g. Let him nt g.。 •3. 有些可用n开头,用来表示禁止性的祈使句。•N + n / ding + 其他成分•e.g N smking! N fishing!
Dn’t smke!N smking!
D exercises
Wash yur hands,please!
Dn’t play ftball!
Wear masks,please!
祈使句,无主语,只用动词就可以.表示请求或命令,加上please表客气。如果变成否定句, Dn’t开头是规律。N talking!是警示,祈使句用法要牢记。
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