most common comparison structure

We can use various words and structures for comparing. Usually there are three types, 1) similarity and identity, 2) equality, 3) inequality.
1) similarity and identity. If we want to say things are similar, we can use as, like, so/neither do I, or too, also and as well. To say things that are identical, we can use the same (as).
  Tom likes swimming, and so do I.
  His books are just the same pages as mine.
2) equality. as(much/many)…as: things are equal in a particular way.
  He has as much money as his brother.
3) inequality. We can use comparative adjectives and adverbs, more /less+adj/adv, or superlative. In some informal usage, we more often use not so …as or not as…as.
 The baby's less ugly than you.
 The baby's not so ugly as you.


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