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注意：有拼寫錯(cuò)誤。如Carefullness 為 Carefulness 之筆誤；carefull 為 careful 之筆誤。下次提交前請(qǐng)先校對(duì)一下。　　

Carefulness is necessary. 名詞作主語，把 carefulness 視為一種品質(zhì)，意指 the quality of being careful and painstaking。　　

To be careful is necessary. 用不定式作主語，強(qiáng)調(diào)動(dòng)作，且暗示指某次特定的情況。　　

Being careful is necessary. 用動(dòng)名詞作主語，與不定式作主語相比，更強(qiáng)調(diào)一般情況（即通常如此）。　　

又如：　　

Everyone needs love. 人人都需要愛（或愛情）。　　

Everyone needs to be loved. 人人都需要有人愛。（不定式的動(dòng)作意味很強(qiáng)）