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

分析 當(dāng)心不要從梯子上摔下來(lái)．

解答 答案：not to fall
根據(jù)關(guān)鍵詞Be careful后接動(dòng)詞時(shí)，應(yīng)該用固定用法be careful to do sth，意為小心翼翼（或仔細(xì)的）去做某事；根據(jù)括號(hào)里的提示詞not fall，可知此句應(yīng)該用其否定形式，帶有動(dòng)詞不定式的否定形式為在to前面直接加not，變?yōu)閎e careful not to do sth，意為小心別…或避免去干某事．此處是指避免從梯子上摔下來(lái)．故填寫(xiě)not to fall．

點(diǎn)評(píng) 此題考查含有動(dòng)詞不定式的短語(yǔ)及其否定形式的變化．記住變化形式便容易作答．

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