We’ll take groß, meaning ‘big’, ‘large’ or ‘tall’, to illustrate how the  following phrases that compare two things work – you can substitute any  adjective or adverb.

Er ist (genau) so groß wie ich.
He is (just) as tall as I/me.

Er ist nicht so groß wie ich.
He is not as tall as I/me. 

Er ist größer als ich.
He is taller than I/me.

Er wird immer größer.
He’s getting taller and taller

In colloquial English we often use an object pronoun in expressions such  as these (i.e. ‘me’), whereas formal grammar demands a subject pronoun  (i.e. ‘I’). No such confusion exists in German where the ich is seen to be a  contraction of … ich bin and thus only a subject pronoun is possible.

When je … desto (the … the) is used in a full sentence, as in the second  example below, note that the first clause has subordinate word order (i.e.  the verb is placed at the end of that clause) and the second clause undergoes  inversion of subject and verb, e.g.

je größer desto besser
the taller the better

Je reicher er wird, desto geiziger wird er.
The richer he gets, the more miserly he becomes