不知所云　例：Many companies began using computers mouth.
　　段落过长，不分段，主语与动词一致问题　She are a good friend of mine that I has known for a　long time.　主语和动词在数方面不一致。
　　句子别扭　We heated the soup in the microwave for too long and the shape of the container changed.　措辞过长或不清。换言之，句子显得滑稽可笑。
　　关联词语重复　Since I want to go to a good school，therefore I am trying to raise my test　scores.　不能在该句的主要主语和主要动词前使用连词。
　　句子不完整　Many students have a hard time passing all the tests to get into college. For example，my friend in high school.　句子没有主要主语或主要动词，因为其实它应是一个从句。这是一个非常常见的错误，修改的方法是将两个句子连接起来。
　　不要使用get　 When I got home，I got tired，so I got a book and got into bed.　Get太不正式，意思也过于含糊，不适合用在正式的场合。应将get改为一个更加具体的单词，如become，receive，　find，achieve，等等。
　　介词多余　I would like to discuss about something important that you mentioned about to　me during yesterday. We went to downtown yesterday to buy a watch. When I first came to the US，　I did not have a lot of friends in here. In class，my classmate never mentioned about her　husband.　在表示这种意思时此单词不能与介词连用。这种情况常见于downtown，home，there，here等词。这些词语在英语中是副词而非名词，因而不能在它们前面添加介词。
　　跑题或不相关　There are many reasons to buy a car，preferably a nice car.　这个意思与文章的主题无关。
　　陈词滥调　It is okay for children to fail sometimes.　所表达的意思很普通　大多数人都已经知道到了，因而就没有必要再说出来。
　　重复冗余　Personally，　I believe what the newspaper prints. 一种意思的表述不止一次，或者某个词语不必要。
　　单数/复数　Many year ago，dinosaur roamed the Earths.　单词需要从单数变为复数，或者由复数变成单数。　单数可数名词　单数可数名词不能单独使用，应该将其变为复数形式或者加上限定词(a，　the，my，his，her，Gary"s，no，any，1，3，50，most，等等)。
　　拼写错误，主语、动词或宾语有问题　I want to buy something for my mother that she will　like it. There was a terrible accident happen yesterday.　句子的基本结构有问题，缺少主语、动词或宾语，或者这些成分重复。
　　语气与文章不符　I was kind of mad at the guy who vociferated angry words at me. I have　heard many wonderful things about such cosmopolitan cities as Paris，London，Tokyo，and Hong　Kong and I would love to visit these cities to check them out.　语气与文章其他部分不相符，可能是过于正式或者太不正式。
　　动词时态错误　Yesterday I will go to the store because tomorrow I needed some food.　动词时态不正确　检查一下是应该用现在时、过去时、将来时还是完成时等等。
　　选词不恰当　I was late getting home because I lost my way.　在这种情况下不应该使用该词　可选择更好的词语或者所使用的词语与文章的总体语气不符。
　　单词形式不当　I want to creation a great web site so that I can becoming wealth.　所使用的单词的形式不正确　检查一下应该使用该词的名词、形容词或副词形式的哪一种。
　　用词错误　Even I don‘t speak Spanish，I was able to find a bathroom in the department　store. I gained a lot of pounds during vacation.　用词错误或在此种情况下该词不是最佳用词。
　　以上就是托福写作中经常出现的问题，一篇优秀的英语作文在内容和语言两方面应是一个统一体，任何一方面的欠缺都会直接影响到作文的质量。以上语句中的出现的常见错误，希望考生能够避免。为了文章的华丽偏用一些另类语句会出彩，但是若写作中有问题，可是得不偿失。