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一、用動詞不定式及它的否定形式造三個句子
用動詞不定式及它的否定形式造三個句子（1） 三個動詞不定式肯定To work out this difficult problem in three days is impossible =It is impossible to work out this difficult problem in three daysTo learn English so well is of great importance to us all =It is of great importance to us all to learn English so well iTo swim across the river is very easy for the little boy =It is very easy for the little boy to swim across the river (1) 三個動詞不定式否定Our teacher often tells us not to be late for school His parents want him not to play with those bad boys The girls are told not to go out alone in the evening /at night。
二、交談時候否定式的句子
肯定句就是對事物作出肯定判斷的句子，否定句就是對事物作出否定判斷的句子. 這兩種句式在表達相同意思時，在語意上往往有輕重強弱的差別. 一般地說，同一句話，用否定句要比用肯定句語意要輕些，弱些. 例如： 1.這個道理容易明白. 2.這個道理不難明白. 這兩句的意思差不多. 例1是肯定的說法，語氣強些；例2是否定的說法，語氣弱些. 否定句有兩種類型： 一、一般否定句. 一般否定句只用一個否定詞，常見的有“不”、“沒”、“沒有”等. 例如： 1.·激光不是一種普通的光. 2.··他沒有來。
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