题目内容
5．He had to confirm his plane ticket in two days in advance．（改为否定句）Hedidn't have to confirm his plane ticket in two days i advance．
分析 他不得不提前两天确认他的机票．
他没有必要提前两天确认他的机票．
解答 答案：didn't have． 根据题意要把原句改为否定句，原句为一般过去时，改为否定句时需要借助于助动词did的否定形式didn't后接had的动词原形have．故答案为：didn't have．
点评 作答时需要区分句子的时态，掌握动词的过去式和原形之间的变化
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