連系動詞後接不定式的用法
連系動詞 be 後根據情況可自由地接不定式作表語: My dream is to be a scientist. 我的夢想是儅一名科學家。 All you have to do is to listen. 你衹需要聽。
seem, appear, prove, turn out, grow 等連系動詞後也可接不定式(尤其是 to be)短語作表語: The man seemed to be ill. 這個人好像病了。 The plan proved to be useful. 這個計劃証明是有用的。 He appears to know this. 他好像知道這一點。 The weather turned out to be fine. 天氣結果很好。 He has grown to like studying English. 他漸漸喜歡學英語了。 若所接不定式爲to be,通常可以省略。
sound, smell, feel, taste, become 等連系動詞後通常不能接不定式: 誤:These oranges taste to be good. (應去掉 to be) 誤:The roses smell to be nice. (應去掉 to be) 連系動詞look後有時也可接to be,但以省略to be 爲普通。