Julia is taller than her friend.
⇒ S1 + tobe + (more) + adj + (er) + than + S2
A banana isn't as sweet as an apple.
⇒ S1 + tobe (not) + as/so + adj + as/so + S2
A fish isn't as big as an elephant.
⇒ S1 + tobe (not) + as/so + adj + as/so + S2
This dress is prettier than that one.
⇒ S1 + tobe + (more) + adj + (er) + than + S2
The weather isn't as hot as yesterday.
⇒ S1 + tobe (not) + as/so + adj + as/so + S2