一、A=B.即A与B双方程度相等时,用“as+原级+as”的结构来表示.例如:
Oilproducedwastegasesalmostasharmfulasthegasesfromfactories.
TomrunsasfastasJack.
Heisafellowastallashiselderbrother.(=Heisastallafellowashiselderbrother.)
二、A≠B.即A与B双方程度不等时,则用“notas(so)+原级+as”的结构来表示.例如:
LondonisnotsomodernasNewYork.
Sounddoesnottravelasfastaslight.
Nooneissoblindasthepeoplewhowillnotsee.
三、A=nB.即双方相比,A是B的若干倍时,用“倍数+as+原级+as”的结构来表示.例如:
Thisroomisabouttwo-thirdsaslargeasthatone.(=Thisroomisabouttwo-thirdsthesizeofthatone.)
Therearetwiceasmanystudentsinourschoolastherewerein1949.
四、A>B.即A方超过B方时,要用“比较级+than”的结构来表示.例如:
SheisfiveyearsolderthanI.(=Sheisolderthanmeby5years.)
Hestudiesharderthananyoftheothersinhisclass.
五、An+B.即A方超过B方的程度和数量时,用“much(far)/threetimes/fiveyearsetc.+比较级+than”的结构来表示.例如:
Heworksfarbetterthanyou.
Annismuchnicerthanhersister.