[誤] I think it is an useful English dictionary.?

　　[正] I think it is a useful English dictionary.?

　　[析] 在不定冠詞a與an的用法中要注意的一點是：an用在以元音開頭的詞之前;而a則用在以輔音開頭的詞之前。要特別注意的是以u字母打頭的單詞，如useful,university等，其第一個音標是[j]，所以要特別予以注意。

　　[誤] I need a hour to finish this letter.?

　　[正] I need an hour to finish this letter.?

　　[析] 要注意hour和honest的第一個字母不發音。

　　[誤] My teacher is a unknown man, but he is a very good man.?

　　[正] My teacher is an unknown man, but he is a very good man.?

　　[析] 要注意以u打頭的單詞，它的發音為[?]時，單數名詞前要用an，如uncle等。

　　[誤] There is a f in the word football.?

　　[正] There is an f in the word football.?

　　[析] 英文字母單獨使用時，如其第一個發音是元音時，其前面的不定冠詞應該用an而不是a.

　　[誤] I have a little brother. He is a 8year old boy.

　　[正] I have a little brother. He is an 8 year old boy.

　　[析] 要注意這些字母的第一個發音為元音，如eight, eleven等。　　

　　able

　　[誤] This bike is able to be repaired.?

　　[正] This bike can be repaired.?

　　[析] be able to 主要表達某事或某人具有某種能力去作某事，應譯為有本領、有能力、可以作某事，如：Im able to swim across this river. 而can可以用來表示具有接受能力或吸收能力。如：This radio can be repaired here.

　　about

　　[誤] This class is about to begin just now.

　　[正] This class is about to begin.

　　[析] 要注意be about to 是將要的意思，含有將來時之意，不要與表示過去時的時間狀語連用。另外，be about to 一般用作書面語，對應的口語是be going to.

　　about on

　　about與on都可以作關于講，但卻有所不同，例如：This book is about physics. 應譯為這是一本關于物理學的科普讀物。而：This book is on physics.則應譯為這是一本物理學方面的專著。?

　　above

　　[誤] The temperature is five degrees over zero.?

　　[正] The temperature is five degrees above zero.?

　　[析] 表達在上方時，above與over是可以互換的，如：The sky is above(or over)our heads. 但是要表達在垂直方向上的上方時則應用above不可用over，如：The sun has risen above the horizon.?

　　[誤] There is often thick cloud above the South of China in summer.?

　　[正] There is often thick cloud over the South of China in summer.?

　　[析] 當表達覆蓋之意時，只可用over而不能用above.?

　　[誤] There is a bridge above the river.?

　　[正] There is a bridge over the river.?

　　[析] 用來表達從上方越過時不能用above只能用over，如：The plane flew over the city. 但要注意There is waterfall above the bridge. 則應譯為在橋的上游有一個瀑布。?

　　across ?

　　[誤] He ran across the wood.?

　　[正] He ran through the wood.?

　　[析] across是指某一動作在一平面內進行，而through則是指該動作在一三維立體空間的運動過程。如：The man came in through the window. He walked across the square.

　　across ?

　　across的主要用法有兩個。其一，意為對面，如：There is a school just across the street. 其二，意為橫過，如：He walked across the street.?

　　afraid ?

　　[誤] I dontt afraid of him.?

　　[正] I am not afraid of him.?

　　[析] 要注意害怕afraid一詞在英語中不是動詞，而是形容詞，要與be動詞連用。?

　　after ?

　　[誤] Two weeks after he left.?

　　[正] Two weeks later he left.?

　　[正] He left after two weeks.?

　　[析] 要表達在多少時間之后，英語中有兩種表達法，即：用later時，要時間在前，如three hours later; 而用after時要時間在后，如after three hours.?

　　[誤] My father will be back after a few hours.?

　　[正] My father will be back in a few hours.?

　　[析] 受中文的影響，這個介詞常常被誤用。當你要表達在一段時間內某個動作可以完成時，一定要用in，而不能用after，因為after是指在某一時間之后。例如：This work will be done in two days. 即表明在兩天內這一工作一定會做完。而如用了after，即表示在兩天之后，完成的時間是不確定的。

　　[誤] I think it is an useful English dictionary.?

　　[正] I think it is a useful English dictionary.?

　　[析] 在不定冠詞a與an的用法中要注意的一點是：an用在以元音開頭的詞之前;而a則用在以輔音開頭的詞之前。要特別注意的是以u字母打頭的單詞，如useful,university等，其第一個音標是[j]，所以要特別予以注意。

　　[誤] I need a hour to finish this letter.?

　　[正] I need an hour to finish this letter.?

　　[析] 要注意hour和honest的第一個字母不發音。

　　[誤] My teacher is a unknown man, but he is a very good man.?

　　[正] My teacher is an unknown man, but he is a very good man.?

　　[析] 要注意以u打頭的單詞，它的發音為[?]時，單數名詞前要用an，如uncle等。

　　[誤] There is a f in the word football.?

　　[正] There is an f in the word football.?

　　[析] 英文字母單獨使用時，如其第一個發音是元音時，其前面的不定冠詞應該用an而不是a.

　　[誤] I have a little brother. He is a 8year old boy.

　　[正] I have a little brother. He is an 8 year old boy.

　　[析] 要注意這些字母的第一個發音為元音，如eight, eleven等。　　

　　able

　　[誤] This bike is able to be repaired.?

　　[正] This bike can be repaired.?

　　[析] be able to 主要表達某事或某人具有某種能力去作某事，應譯為有本領、有能力、可以作某事，如：Im able to swim across this river. 而can可以用來表示具有接受能力或吸收能力。如：This radio can be repaired here.

　　about

　　[誤] This class is about to begin just now.

　　[正] This class is about to begin.

　　[析] 要注意be about to 是將要的意思，含有將來時之意，不要與表示過去時的時間狀語連用。另外，be about to 一般用作書面語，對應的口語是be going to.

　　about on

　　about與on都可以作關于講，但卻有所不同，例如：This book is about physics. 應譯為這是一本關于物理學的科普讀物。而：This book is on physics.則應譯為這是一本物理學方面的專著。?

　　above

　　[誤] The temperature is five degrees over zero.?

　　[正] The temperature is five degrees above zero.?

　　[析] 表達在上方時，above與over是可以互換的，如：The sky is above(or over)our heads. 但是要表達在垂直方向上的上方時則應用above不可用over，如：The sun has risen above the horizon.?

　　[誤] There is often thick cloud above the South of China in summer.?

　　[正] There is often thick cloud over the South of China in summer.?

　　[析] 當表達覆蓋之意時，只可用over而不能用above.?

　　[誤] There is a bridge above the river.?

　　[正] There is a bridge over the river.?

　　[析] 用來表達從上方越過時不能用above只能用over，如：The plane flew over the city. 但要注意There is waterfall above the bridge. 則應譯為在橋的上游有一個瀑布。?

　　across ?

　　[誤] He ran across the wood.?

　　[正] He ran through the wood.?

　　[析] across是指某一動作在一平面內進行，而through則是指該動作在一三維立體空間的運動過程。如：The man came in through the window. He walked across the square.

　　across ?

　　across的主要用法有兩個。其一，意為對面，如：There is a school just across the street. 其二，意為橫過，如：He walked across the street.?

　　afraid ?

　　[誤] I dontt afraid of him.?

　　[正] I am not afraid of him.?

　　[析] 要注意害怕afraid一詞在英語中不是動詞，而是形容詞，要與be動詞連用。?

　　after ?

　　[誤] Two weeks after he left.?

　　[正] Two weeks later he left.?

　　[正] He left after two weeks.?

　　[析] 要表達在多少時間之后，英語中有兩種表達法，即：用later時，要時間在前，如three hours later; 而用after時要時間在后，如after three hours.?

　　[誤] My father will be back after a few hours.?

　　[正] My father will be back in a few hours.?

　　[析] 受中文的影響，這個介詞常常被誤用。當你要表達在一段時間內某個動作可以完成時，一定要用in，而不能用after，因為after是指在某一時間之后。例如：This work will be done in two days. 即表明在兩天內這一工作一定會做完。而如用了after，即表示在兩天之后，完成的時間是不確定的。