Various words and structures can be used for comparing.
1. Similarity and identity: as, like, so do I, too, the same, etc
If we want to say that people, things, actions or events are similar, we can use as or like, so/ neither do I and similar structures or adverbs
such as too, also and as well . To say that they are identical, we can use
the same (as).
- He liked working with horses, as his father did.
- Your sister looks just like you.
- She likes music, and so do
- The papers were late and the post was too.
- His eyes are just the same colour as mine.
2. equality: as … as
To say that people, things etc are equal in a particular way, we often use the
structure as (much/ many) … as
- My hands were as cold as ice. I earn as much money as you.
3. inequality: more … than; older … than; most, oldest, etc
To say that people, things etc are unequal in a particular way, we can use
comparative adjectives and adverbs, or more + adjective/adverb
- He’s much older than her. The baby’s more attractive than you.
To say which one of a group is outstanding in a particular way, we can use a
superlative or most + adjective/adverb
- You’re the laziest and most annoying person in the whole office.
4. inequality: less, least; not so/as … as
We can also talk about inequality by looking at the ‘lower‘ end of the scale.
- One possibility is to use less (than)
- The baby’s less ugly than you.
- I want to spend the least possible time working.
In informal usage, we more often use not so … as or not as … as
- The baby’s not so ugly as you.