主语从句有以下连接词及其用法： 　　1.That 　　Thatmattertakesupspaceisknowntoall.(=Itisknowntoallthatmattertakesupspace.) 　　2.whether(if) 　　Whethersheiswilljoinusdoesn'tmattertoomuch.(=Itdoesn'tmattertoomuchwhether(if)sheiswilljoinus.) 　　3.what 　　Whatistobedonenexthasn'tbeendecidedyet.(=Ithasn'tbeendecidedyetwhatistobedonenext.) 　　4.which 　　Whichtestistobemadefirstremainstobediscussedfurther.(=Itremainstobediscussedfurtherwhichtestistobemadefirst.) 　　5.who 　　Whowillheadthedelegationisunknown.(=Itisunknownwhowillheadthedelegation.) 　　6.whoever 　　Whoeverwillgomaysignhere. 　　7.whatever 　　Whateverstepsyoutakeshouldbepractical. 　　8.whichever 　　Whichevercomesinfirstwillreceiveaprize. 　　9.what(so)ever 　　What(so)everwedomustbenefitthepeople. 　　10.whichever 　　Whicheveryouwantisyours. 　　11.When,whereandhowwearetogoisstillamystery.(=Itisstillamysterywhen,whereandhowwearetogo.) 　　12.Whysheisabsentthismorninghasn'tbeenclear.(=Ithasn'tbeenclearwhysheisabsentthismorning.)