第6課

　　關(guān)于逗號(hào)的一些知識(shí)
　　原則：逗號(hào)沒(méi)有能力連接兩個(gè)單獨(dú)的句子。
　　如何區(qū)分短語(yǔ)與句子？一個(gè)結(jié)構(gòu)如果有完整的謂語(yǔ)部分就是句子。
　　何為完整的謂語(yǔ)部分？如果能判斷出一個(gè)結(jié)構(gòu)的時(shí)態(tài)就可以稱這個(gè)結(jié)構(gòu)為完整的謂語(yǔ)部分。
　　在什么樣的情況下一個(gè)逗號(hào)可以將句子分成兩部分，而這兩部分都有完整的謂語(yǔ)呢？
　　1 兩個(gè)句子中間有連接詞連接；
　　2 這兩個(gè)句子是主從句關(guān)系（主從句之間一定要有句子引導(dǎo)詞來(lái)引導(dǎo)）。
　　10. Walter offered us a lift when he wasleaving the office, but our work _A_, we declined the offer. [declined v. 婉言謝絕]
　　A not being finished B not having finished
　　C had not been finished D was not finished
　　42. A survey was carrie3d out on the deathrate of new-born babies in that region, _D_ were surprising. [survey 調(diào)查]
　　A as results B which results C the results of it D the results of which
　　51. All flights _D_ because of thesnowstorm, many passengers could no nothing but take the train. [having beencanceled這里是獨(dú)立主格作原因狀語(yǔ)]
　　A had been canceled B have been canceled
　　C were canceled D having been canceled