1，He is absent today, for he is ill. 他今天缺席了，因为他生病了。
2，He could not have seen me, for I was not there. 他不可能见过我， 因为我不在那里。
3，He seldom goes out now,for he is very old. 他现在难得出门了，因为他年事已高。
4，The day breaks, for the birds are singing. 天亮了，因为鸟叫了。
5，It will rain, for it's getting dark, 要下雨了，因为天气越来越暗。
6，She is your sister, for this, you should respect her. 她是你的姐姐，因为这个原因，你应该尊重她。
7，He must be in now, for the light in his room is on. 他现在一定在家，因为他房间的灯是亮着的。
8，The days are short, for it is now December. 白天短了，因为现在已是十二月份。
9，It must have rained, for the ground is wet. 一定是下雨了，因为地面是湿的。
10，I could not go, for I was ill. 我没能去，是因为我病了。
11，He felt no fear, for he was a brave boy. 他没有害怕，因为他是个勇敢的男孩。
12，He found it increasingly difficult to read, for his eyesight was beginning to fail. 他发现越来越难以阅读，因为他的视力开始衰退。
13，A man cannot smile like a child, for a child smiles with his eyes, while a man smiles with his lips alone. 一个大人不会像一个小孩那样笑，因为一个孩子是用眼睛在微笑，而一个大人只是用嘴在笑。
14，It rained last night, for the ground is wet. 昨晚下雨了，因为地面是湿的。
15，She must have gone out early, for she had not come for breakfast. 她一定早早就出去了，因为她没来吃早餐。
16，He didn't come to school, for he was sick. 他没来上学，因为他病了。
17，Henry must have stayed up last night, for he looks so tired and sleepy. 亨利昨晚一定是熬夜了，因为他看起来很疲劳和困倦。
18，The Titanic was sinking rapidly, for five of her sixteen watertight compartments had already been flooded. 泰坦尼克号正在急速下沉，五个密封舱已经被洪水淹没。
19，I asked her to stay to tea, for I had something to tell her. 我请她留下来喝茶，因为我有事要告诉她。
20，I stay at home, for the weather is cold. 我在家呆着，因为天气太冷了。
