Se utilizan cuando una o más oraciones expresan grados de comparación por semejanza o diferencia. As/ as ... as .../ not as ... as .../ as if/ as though.
as...as - tan...como
not as...as - no tan..como
not so...as - no tan...como
as if / as though - como si
than - que
as - como
- He performed the operation exactly as he was told.
El ejecutó la operación exactamente como se le dijo. - Nobody knows that subject as I do.Nadie conoce ese tema como yo.
as...as - tan...como
not as...as - no tan..como
- His car is as fast as mine.Su auto es tan veloz como el mío.
- They are not as good as you think.Ellos no son tan buenos como tu piensas.
not so...as - no tan...como
- His second book was not so good as the first one.
Su segundo libro no fue tan bueno como el primero. - She was not so beautiful as her mother.
Ella no era tan bonita como su madre.
as if / as though - como si
- They treat me as if they didn't know me.
Me tratan como si no me conocieran - Bill started to spend money as though he had won the lottery.Bill comenzó gastar dinero como si hubiera ganado la lotería.
than - que
- They started to have more problems than they expected.
Empezaron a tener m ás problemas que lo que esperaban. - Learning English is more difficult than most people think.Aprender inglés es más dificil que lo que la mayoría cree.
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