1.Soil土壤
earthinwhichplantsgrow
Thesoilisnotveryrichinourbackyard.
Iboughtsomesoiltoputintothegarden.
2.as...as
Thistestisasdiffcultasthetestlastweek.
LondonisasexpensiveasTokyo.
3.Willing
beingreadyorhavingdesireto
Areyouwillingtojoinmetomorrow?
Ithinkheiswillingtodothejob.
4.unless
use"unless"tomean"ifnot"inthefirstconditional
Unlessyoucome,wewillnotbeabletomakeadecision.
Shewillgiveupunlessshehassomesuccesssoon.