。這算個常識，知道，會用就行了，沒必要追本溯源。背過新概念課文的人，對A puma at large肯定印象深刻，其中有一句： The experts were now fully convinced that the annimal was a puma,but where had it come from?理論上，正確的用法應該是convince sb.of sth——本來是要有介詞of的，但因為後面是that引導的從句，所以這裡本來應該有的of就被幹掉了。that引導的從句，無論什麼從句，都有一個標準性的特點——不用在介詞後面。碰到介詞遇到that從句的情況，介詞就要被幹掉了。有例外：in that... 但也有語法學家也認為它們是複合連詞，in不算介詞。except / but that...這樣解釋，所以這三個就不算例外，是複合連詞。新概念3裡面還有個句子：After telling several of his friends about the theft,Dimitri found out that his neighbour, Aleko,had suddenly acquired a new clamb. 在這個句子裡 found out＋that從句，out之所以沒被幹掉，out在這裡不是介詞，out在這裡是副詞。介詞後面必須要有賓語。
。這算個常識，知道，會用就行了，沒必要追本溯源。背過新概念課文的人，對A puma at large肯定印象深刻，其中有一句： The experts were now fully convinced that the annimal was a puma,but where had it come from?理論上，正確的用法應該是convince sb.of sth——本來是要有介詞of的，但因為後面是that引導的從句，所以這裡本來應該有的of就被幹掉了。that引導的從句，無論什麼從句，都有一個標準性的特點——不用在介詞後面。碰到介詞遇到that從句的情況，介詞就要被幹掉了。有例外：in that... 但也有語法學家也認為它們是複合連詞，in不算介詞。except / but that...這樣解釋，所以這三個就不算例外，是複合連詞。新概念3裡面還有個句子：After telling several of his friends about the theft,Dimitri found out that his neighbour, Aleko,had suddenly acquired a new clamb. 在這個句子裡 found out＋that從句，out之所以沒被幹掉，out在這裡不是介詞，out在這裡是副詞。介詞後面必須要有賓語。