《IT职业英语》课件unit7 Relativeattributive clauses定语从句

一、定语从句种类限定性定语从句非限定性定语从句二、定语从句定义定语从句用来详细说明说话者所指的人或物。三、限定性定语从句和非限定性定语从句的区别限定性定语从句用来详细说明说话者所指的人或物；非限定性定语从句用来提供说话者所指的人或物的额外信息。四、定语从句的结构定语从句的结构有三部分：1先行词(被描述的人或事)；2关系代词（代替先行词、且在从句中充当句子成分的代词）和关系从句（描述先行词的句子）。五、例句1. 限定性定语从句

ThetermWWWisusedtodescribeaninterlinkedsystemofdocumentsinwhichausermayjumpformonedocumenttoanotherinanonlinear,associativeway.

E-commercehasgrownoutofbusinessesthatstartedtoadvertisetheirpresenceviaaWebsite.

Thepersonwhowasinvolvedinthisincidenthasbeenputonprobationandsenttoaspecialtrainingclass.2. 省略定语从句

省略定语从句分两种情况：省略关系代词或省略关系代词＋be动词两种形式。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. 非限定性定语从句

TheTerm“PC”isoriginallyusedtodescribeanIBM-compatiblepersonalcomputer,whichhasanIntelCPUasitsmicroprocessor.4. 举例说明限定性定语从句和非限定性定语从句的区别

MysisterwholivesinLondonismarriedtoacomputerprogrammer.

Mysister,wholivesinLondon,ismarriedtoacomputerprogrammer.

第一个句子是限定性定语从句，它隐含着“我有其他姐妹”的意思。第二句话言外之意是“一个姐妹”。因为先行词前有“，”所以是非限定性定语从句。

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