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(1) 保留连词“if”则必须使用陈述语序结构表达,即“if it had not been for”
(2)去掉连词“if” ,则必须使用倒装结构语序表达,即“Had it not been for”
备注:if it is not for ...意思“要不是” ,可以有以下几个变体
(1)If it were not for ...=Were it not for (对现在虚拟)
(2)If it had not been for ...=Had it not been for(对过去虚拟)
备注:去掉连词“if”之后,只需要把“系动词were提前到句首,把助动词had提前到句首,其他词原来位置不变。”
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