I'm afraid I won't be able to...恐怕我不能…

　　I'm busy with (doing)...我正忙于……

　　I'm considering (doing)...我正考虑…

　　I'm convinced that...我确信…

　　I'm curious to (do) about...我对(做)……很好奇

　　I'm determined to...我决定…

　　I'm getting a little concerned about...我对……有点担忧.

　　I'm interested in...我对……感兴趣

　　I'm (just) calling to...我打电话来是要…

　　I'm (not) sure...我(不是)很确定…

　　I'm not very interested in...我对……不是很感兴趣

　　I'm occupied (with)...我忙于…

　　I'm really fond of...我的确喜欢…

　　I'm really (terribly) sorry for...我对……感到非常抱歉

　　I've been thinking about...我一直想…

　　I have a desire to...我非常渴望…

　　I've decided to...我已经决定…

　　If I did..., I would...如果我……,我会…

　　If I had done..., I would have done...如果我……,我就会…

　　If I were you... I would...如果我是你……,我就会…

　　If only...! 真希望……!若是……那该多好啊!

　　If it is possible 可能的话…

　　If you ask me, I think...如果你问我,我认为…

　　If you want to...you'll have to...如果你想……,你将不得不…

　　In a word...总之,…

　　In brief (short) ...简言之,……

　　In conclusion, ...最后,…….聪之,……

　　In general —般而言,……

　　In my opinion (view) 我认为……

　　In order to you should...为了…·你应该

　　In other words 换句话说……