Whatever，whoever，whichever，whenever，wherever，whoever均引导让步状语从句，相当于nomatter与what，who，which，when，where，how连用.
Whatever(=Nomatterwhat)mayhappen，weshallnotlosehope.
Whoever/Nomatterwhocomes，hewillbewelcome.
Whenever/Nomatterwhenithappened，itwascertainlynotyesterday.
Wherever/Nomatterwherehewent，hemadefriendswithpeople.
17.unless除非，如果不(=if…not)
Ishallgotomorrowunlessitrains.
------ShallTomgoandplayfootball？
------Notunlesshehasfinishedhishomework.
Unlessthesunweretoriseinthewest，Iwouldn’tbreakmyword.
Iwon’tattendhisbirthdaypartyunlessinvited(=unlessIaminvited)
18.as/solongas只要
So/aslongasyoukeepontrying，youwillsurelysucceed.
So/aslongasyousticktoyourplansforyourstudy，youaresuretomakegreatprogress.
-----Whatareyougoingtodothisafternoon？
-----Iwillprobablygoforawalklateronsolongasitstaysfine.
19.supposing/suppose(that)假定；假如
Suppose/supposing(that)Idon’thaveadayoff，whatshallwedo？
Supposexequalstoy，thenyoucanworkouttheresult.
Providing/provided(that)=onconditionthat假如，在…条件下
I’lllendyouthemoneyonconditionthatyoucanreturnitinthreemonths.
I’llgoproviding/providedthatmyexpensesarepaid.
20.given(that)…=take….intoconsideration鉴于，考虑到
Giventhegovernment’srecordonunemployment，theirchancesofwinningtheelectionlookpoor.
Giventheirinterestinchildren/giventhatsheisinterestedinchildren，Iamsureteachingistherightcareerforher.
Grantedthat的确wｗw.ExamＷ.CoM
Grantedthatit’sasplendidcar，buthaveyouseenwhatitcosts？
