1、词语辨析：be in danger；be dangerousbe in danger (of)表示主语处在危险之中，反义词为be out of danger，意为“脱离危险”。be dangerous表示主语是“危险的”，可能对别人或其他事物构成危害。A tiger is a dangerous animal.老虎是危险的动物。The tiger is in danger of dying out. 老虎正濒临灭绝。词语辨析：contain；include contain指“包含；装有”，可以指包含全部或部分。着重指“内有”。include指“包括；包含”，着重指“被包含者只是整体的一部分”。
2、This book contains all the information you need. 这本书包含了你需要的所有信息。The book contains ten chapters，including “The use of it”这本书包含了10章内容，其中包括 “it的用法”。比较下列两个句子，注意include的位置和形式：Six were killed，including the boy. Six were killed，the boy included. 连那个小孩在内共6人丧生。词语辨析：long before；before longlong before是“早在之前很久”
3、；而before long是“不久以后”，相当于soon after / shortly after，既可以指将来，也可以指过去，所以与过去时或将来时连用。It looks as if it will snow before long.看样子似乎不久就要下雪了。I knew Smith long before I knew you. 早在我认识你以前，我就认识史密斯了。词语辨析：year by year；year after year year by year指逐年的，有变化的。year after year则指“年复一年”，意为每年重复的。Year after year I have had
4、 a letter from Arthur on New Years Day.每年的元旦我都会收到亚瑟的来信。Year by year their love for each other grew stronger.一年一年地，他们对彼此的爱愈加强烈。Dear _， Im glad to receive your letter asking for my advice on_./Im glad to write the letter to you on _. Here are a few suggestions for your reference.First，it is important to_.As youll _.Then，it also helps if you_.Besides，it should be a good idea to _.Because _.You can also _.Im sure that_. I hope _. Sincerely yours， Signature称呼提出写信的原因过渡句引出建议提出第一条建议第一条建议的理由提出第二条建议及理由提出第三条建议及理由提出第四条建议第四条建议的理由表达本人的愿望
