第一、that 用作形容詞（后接復(fù)數(shù)名詞時(shí)用those）.
　　它用來(lái)指已被提到的人或物；也可表對(duì)比,指兩個(gè)中較遠(yuǎn)的那個(gè).
　　What about that book you borrowed from me last month?
　　請(qǐng)注意,that 有時(shí)候在句子中具有喜歡或輕蔑等感情色彩.
　　that little son of his 他那個(gè)小寶貝兒子
　　That George!喬治那家伙!（含有輕蔑語(yǔ)氣）
　　第二、that 用作代詞.
　　1.that 用作指示代詞（復(fù)數(shù)形式是those）,其指代意義同形容詞用法,同時(shí)它還可以用作定語(yǔ)從句中的先行詞；還可為了避免重復(fù),代替前述名詞.
　　That is what he told me.
　　What is that (which) you have got in your hand?
　　The price of rice is higher than that of flour.
　　2.that 用作關(guān)系代詞,引導(dǎo)限制性定語(yǔ)從句.先行詞可人可物,用法相當(dāng)于who或which.（但是在下列情況下多用that：先行詞既有人又有物時(shí)；先行詞有形容詞最高級(jí)、序數(shù)詞、不定代詞、very,only等修飾時(shí)；先行詞是不定代詞時(shí)）
　　He talked about the teachers and schools that he had visited.
　　I think it one of the most wonderful films that the film company has ever produced.
　　She has little information that is useful for our research.
　　Is there anything that I can do for you?
　　請(qǐng)注意,that 在定語(yǔ)從句中作賓語(yǔ)時(shí)通常可省略.
　　The books (that) I sent you will help you in your studies.
　　第三、that 用作連詞,引導(dǎo)名詞性從句,狀語(yǔ)從句和強(qiáng)調(diào)句.
　　1.that名詞性從句.
　　①引導(dǎo)賓語(yǔ)從句.及物動(dòng)詞后的引導(dǎo)詞that可省略.
　　I didn't expect (that) he could win the championship.
　　The teacher pointed out that Tom was not working hard enough.
　?、?引導(dǎo)主語(yǔ)從句.通常采用it作形式主語(yǔ)的句型.
　　That the earth goes around the sun is known to everyone.
　?。↖t is known to everyone that the earth goes around the sun.）
　　③引導(dǎo)表語(yǔ)從句.
　　The trouble is that we are short of money.
　?、芤龑?dǎo)同位語(yǔ)從句.
　　引導(dǎo)同位語(yǔ)從句的that和引導(dǎo)定語(yǔ)從句的that是不同的.前者只起語(yǔ)法作用,在從句中不作任何成分；而后者在定語(yǔ)從句中作主語(yǔ)、賓語(yǔ)或表語(yǔ).舉例說(shuō)明：
　　The news that he resigned from office surprised us.
　　The idea that he holds is very common nowadays on campus.
　　2.that引導(dǎo)狀語(yǔ)從句
　　①引導(dǎo)目的狀語(yǔ)從句.
　　Bring it nearer that I may see it better.
　?、谝龑?dǎo)結(jié)果狀語(yǔ)從句.
　　What have I done that he should be so angry with me?
　　③引導(dǎo)原因狀語(yǔ)從句.
　　I am afraid that I will fail in the driving test.
　?、芤龑?dǎo)讓步狀語(yǔ)從句.意為“雖然、盡管”.
　　Difficult that/as the task was,they managed to accomplish it on time.
　?、菀龑?dǎo)條件狀語(yǔ)從句.意為“假使、假設(shè)”.
　　Supposing that you were in my position,what would you do?
　　On condition that you were lost in the desert,you should ask for help as soon as possible.
　　3.引導(dǎo)強(qiáng)調(diào)句.
　　It is Mrs.White that makes the decision in her family,not her meek little husband.
　　It is an ill wind that blows nobody good.
　　第四、that用作副詞.
　　1.that用作普通副詞.
　　I was that/so angry I could have hit him.
　　2.that用作關(guān)系副詞.引導(dǎo)定語(yǔ)從句,可以代替when,where,why或 in which,?？墒÷?
　　I will never forget the evening (that) / when we went to the theatre.
　　The house (that)/where I used to live has been knocked down.
　　第五,與that 有關(guān)的常見(jiàn)重要短語(yǔ).
　　1.in that,意為“既然、因?yàn)椤?
　　Criticism and self-criticism is necessary in that it helps us correct our mistakes.
　　2.now that,意為“既然、由于”.
　　Now that they have taken matters into their hands,the pace of events has quickened.
　　3.see (to it) that,意為“注意、務(wù)必做到、保證”.
　　We will see to it that she gets home early.
　　See to it that you are not late again.
　　4.seeing that,意為“鑒于、由于”.
　　Seeing that it is 8 o'clock,we'll wait no longer.
　　Seeing that he was busy with his work,I didn't disturb him.