《IT職業(yè)英語》課件unit7 Relativeattributive clauses定語從句

一、定語從句種類限定性定語從句非限定性定語從句二、定語從句定義定語從句用來詳細說明說話者所指的人或物。三、限定性定語從句和非限定性定語從句的區(qū)別限定性定語從句用來詳細說明說話者所指的人或物；非限定性定語從句用來提供說話者所指的人或物的額外信息。四、定語從句的結構定語從句的結構有三部分：1先行詞(被描述的人或事)；2關系代詞（代替先行詞、且在從句中充當句子成分的代詞）和關系從句（描述先行詞的句子）。五、例句1. 限定性定語從句

ThetermWWWisusedtodescribeaninterlinkedsystemofdocumentsinwhichausermayjumpformonedocumenttoanotherinanonlinear,associativeway.

E-commercehasgrownoutofbusinessesthatstartedtoadvertisetheirpresenceviaaWebsite.

Thepersonwhowasinvolvedinthisincidenthasbeenputonprobationandsenttoaspecialtrainingclass.2. 省略定語從句

省略定語從句分兩種情況：省略關系代詞或省略關系代詞＋be動詞兩種形式。例如：

Thiscomputer(which/that)Iboughtfromyoucan’tconnecttotheInternet.

(omittingtherelativepronoun:which/that)

ThedialectofSQL(which/thatis)supportedbyMicrosoftSQLServeriscalledTransact-SQL(T-SQL).

T-SQListheprimarylanguage(which/thatis)usedbyMicrosoftSQLServerapplications.

(omittingtherelativepronounandbe-verb:which/thatbe)3. 非限定性定語從句

TheTerm“PC”isoriginallyusedtodescribeanIBM-compatiblepersonalcomputer,whichhasanIntelCPUasitsmicroprocessor.4. 舉例說明限定性定語從句和非限定性定語從句的區(qū)別

MysisterwholivesinLondonismarriedtoacomputerprogrammer.

Mysister,wholivesinLondon,ismarriedtoacomputerprogrammer.

第一個句子是限定性定語從句，它隱含著“我有其他姐妹”的意思。第二句話言外之意是“一個姐妹”。因為先行詞前有“，”所以是非限定性定語從句。

ExerciseFillinthegapswithanappropriaterelativepronoun:1. Electroniccommerceisasystem__________includesnotonlysellingandbuyinggoodstransactionsbutalsotransactionsgeneratingdemandforgoodsandofferingsalessupport.2. Thesoftware__________waswrittenforembeddedsystemisoftencalledfirmware.3. Therules__________aredefiningdatarelationshipsmustnotbeviolated.4. Whatisthenameofthecomputerdepartmentmanager__________softwareyouborrow.5. Thecomputercentre__________wewenttowasreallybeautiful.6. Doyouknowthedate__________wehavetohandinourassignment.7. Doyouknowthereason