1、1. Never trouble trouble till trouble troubles you. 麻烦没来找你，就别去自找麻烦。 第一、四个 trouble 是动词，第二、三个 trouble 是名词。2. I think that that that that that student wrote on the blackboard was wrong. 我认为那个学生写在黑板上的那个“that”是错误的。第一个 that 是连词，引起宾语从句；第二、五个 that 是指示代词“那个” ；第三个 that 在这儿相当于名词；第四个 that 是关系代词，引起定语从句。3. I know
2、. You know. I know that you know. I know that you know that I know. 我知道。你知道。我知道你知道。我知道你知道我知道。4. The quick brown fox jumps over a lazy dog. 那只敏捷的棕色狐狸跳过了一只懒惰的狗。这个句子包含了英语中的 26 个字母。5. Was it a bar or a bat I saw? 我看到的是酒吧还是蝙蝠？这是一句回文句，顺着读和倒着读是一样的。6. 上联： To China for china, China with china, dinner on china. 去中国买瓷器，中国有瓷器，吃饭靠瓷器。下联：到前门买前门，前门没前门，后门有前门。Go front door buy front door, front door no front door,behind door with front door这是一副对仗工整、妙趣横生的英汉对联。下联中的第二、四、五个“前门”指“大前门”香烟。
