SE ENCUENTRA PRESENTE EN UNA ORACION CUANDO LO QUE SE COMPARA TIENE LA MISMA CARACTERISTICA. POR EJEMPLO CUANDO DECIMOS EN NUESTRO IDIOMA: MARIO ES TAN ALTO COMO SU PADRE. ACA ESTAMOS COMPARANDO A 2 PERSONAS Y ELLAS TIENEN EL MISMO CALIFICATIVO( ALTO ). EN INGLES EL ADJETIVO A EMPLEAR EN ESTE TIPO DE COMPARACION PUEDE SER DE CUALQUIER TIPO; ES DECIR CORTO O LARGO. TAMBIEN ES IMPORTANTE DESTACAR QUE LA ESTRUCTURA QUE CARACTERIZA A ESTE TIPO DE COMPARACION ES " AS AS " EL PRIMER "AS" SIGNIFICA "TANTO" Y EL SEGUNDO "AS" SIGNIFICA " COMO ". FIJENSE EN LA ESTRUCTURA DE UNA ORACION DENOTANDO UN COMPRATIVO DE IGUALDAD. Sujeto+verbo+AS+adjetivo corto o largo+AS+otro sujeto a comparar.

Para comparar adjetivos en oraciones afirmativas utilizamos la estructura: as as MARIO IS AS TALL AS HIS FATHER.  Mario es tan alto como su padre A CAR IS AS EXPENSIVE AS A HOUSE.  Un coche es tan caro como una casa. ROSE AND MARY ARE AS PRETTY AS HELEN.  ROSA y María son tan bonita como ELENA. CHARLES IS AS HANDSOME AS JOSEPH.  Charles es tan guapo como jose Peter is as happy as Mary.  Peter es tan feliz como mary

MARIO IS AS TALL AS HIS FATHER.  mario is not tall as his father A CAR IS AS EXPENSIVE AS A HOUSE.  a car is not as expensive as a house ROSE AND MARY ARE AS PRETTY AS HELEN.  rose and mary are not pretty as helen CHARLES IS AS HANDSOME AS JOSEPH.  Charles is not as handsome as joseph Peter is as happy as Mary.  Peter is not as happy as Mary.

 Detrás del segundo 'as' puede ir un pronombre sujeto, un pronombre objeto o el sujeto seguido del auxiliar correspondiente  Peter is not as happy as she.  Peter is not as happy as her.  Peter is not as happy as she/Mary is.  Peter no es tan feliz como ella.

 Cuando la comparación se hace entre dos sustantivos se usa: o As much... as para los sustantivos incontables. o As many.... as para los contables (en plural). I earn as much money as my husband. Gano tanto dinero como mi marido. She has as many dresses as you.  Tiene tantos vestidos como tú.

 Cuando la comparación se hace entre dos verbos se puede usar la expresión as much as + auxiliar correspondiente (tanto en oraciones afirmativas como en negativas).  He doesn´t play as much as he should.  No juega tanto como debería.