题目内容

16．Be carefulnot to fall （not fall） off the ladder．

分析 当心不要从梯子上摔下来．

解答 答案：not to fall
根据关键词Be careful后接动词时，应该用固定用法be careful to do sth，意为小心翼翼（或仔细的）去做某事；根据括号里的提示词not fall，可知此句应该用其否定形式，带有动词不定式的否定形式为在to前面直接加not，变为be careful not to do sth，意为小心别…或避免去干某事．此处是指避免从梯子上摔下来．故填写not to fall．

点评 此题考查含有动词不定式的短语及其否定形式的变化．记住变化形式便容易作答．

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