1、主謂不一致
例. When one have money ,he can do what he want to. (人一旦有了錢，他就能想干什么就干什么。)
剖析：one是單數(shù)第三人稱，因而本句的have應(yīng)改為has;同理，want應(yīng)改為wants。本句是典型的主謂不一致。
改為：Once one has money, he can do what he wants (to do).
2、詞性不一致
“詞性不一致”常表現(xiàn)為：介詞當(dāng)動詞用;形容詞當(dāng)副詞用;名詞當(dāng)動詞用等。
例. None can negative the importance of money.
剖析：negative 系形容詞，誤作動詞。
改為：None can deny the importance of money.
3，句子前后不一致
托福寫作中的句子前后不一致是指一個句子前言不對后語，或是結(jié)構(gòu)上不暢通，這也是考生常犯的毛病。
例. The fresh water, it is the most important things of the earth.
剖析：The fresh water 與逗號后的it 不連貫。It 與things 在數(shù)方面不一致。
改為：Fresh water is the most important thing in the world.
4，指代對象不一致
這里的指代對象不一致主要講的是代詞與被指代的人或物關(guān)系不清，或者先后所用的代詞不一致。把這一項單獨提出來是因為大家實在很青睞這一部分：
Mary was friendly to my sister because she wanted her to be her bridesmaid. (瑪麗和我姐姐很要好，因為她要她做她的伴娘。)
讀完上面這一句話，讀者無法明確地判斷兩位姑娘中誰將結(jié)婚，誰將當(dāng)伴娘。如果我們把易于引起誤解的代詞的所指對象加以明確，意思就一目了然了。這個句子可改為：
Mary was friendly to my sister because she wanted my sister to be her bridesmaid.
例. And we can also know the society by serving it yourself.
剖析：句中人稱代詞we 和反身代詞yourself指代不一致。
改為：We can also know society by serving it ourselves.