1.他昨天没来上学，因为他病了。 He did not come to school yesterday because he was ill. 2.既然你今天休息，你最好帮我补习数学。(since) Since you are free today, you’d better help me with my mathematics. 3.由于太匆忙，他把包丢家了。
As he was in a hurry, he left his bag home. 4.他摇摇头，因为他的想法与此不同。 He shook his head, for he thought differently.