使用了动词而不是名词 – 有些单词同时拥有动词和名词的形式，但两者之间存有差异。例如，success是名词，但succeed是动词。如果你不能确定哪个是动词形式，请查字典，以确保所使用的单词是正确的形式。
正确的 - I will try to succeed in my studies.
The jet will fly from here to San Francisco.
错误的 - I will try to success in my studies.
The jet will flight from here to San Francisco.
使用了形容词而不是副词 - 形容词是用来修饰名词的，而副词是用来修饰动词的。副词经常是由形容词加上了词尾-LY而造成的单词。因此，beautiful是一个形容词，但beautifully是一个副词。
有时候，两个完全不同的单字，一个是形容词，一个是副词，但具有相同的含义。一个常见的错误是不能识别good 是形容词，well是副词。通常情况下，错误地使用good这个形容词来代替well这个副词。
正确的 - I think red is a beautiful color.
That is a good idea. She runs well.
错误的 – I think red is a beautifully color.
That is a well idea. She runs good.
Using a verb instead of a noun - Some words exist both as a noun and as a verb but with differences between the noun form and the verb form. For example, success is a noun, but succeed is a verb. If you are unsure of which is the verb form, check your dictionary to make sure you are using the correct form of the word.
Correct - I will try to succeed in my studies.
The jet will fly from here to San Francisco.
Not Correct - I will try to success in my studies.
The jet will flight from here to San Francisco.
Using an adjective instead of an adverb – Adjectives are used to modify nouns. Adverbs are used to modify verbs. Adverbs are frequently made by adding the ending, -ly, to the adjective. Thus beautiful is an adjective, but beautifully is an adverb.
Sometimes an adjective and an adverb are different words altogether, but have the same meaning. A common mistake is confusing the adjective, good, with the adverb, well. Usually the error uses good as an adjective instead of the adverb, well.
Correct - I think red is a beautiful color.
That is a good idea. She runs well.
Not correct – I think red is a beautifully color.
That is a well idea. She runs good.