Don't use "to", "than", or "like" instead of "as"; Don't use a quality noun instead of a quality adjective.
96. General difference - "different from" and "different".
"different from" is used between two nouns compared, and "different" is used after the two nouns or after a plural noun.
A is different from B.
This hat is different from that one.
A and B are different.
This hat and that one are different.
noun(plural) are different.
These hats are different.
Don't use "to" and "than" instead of "from"; Don't use "different" between the two nouns compared.
97. General difference - "to differ from".
"Differ" is verb and must change forms to agree with the subject.
A is different from B.
This hat is different from that one.
A DIFFER(finite form) from B.
This hat differs from that one.
A she-sparrow didn't differ from a he-sparrow during the winter.
Don't use forms of BE with "differ"; Don't use "to","of", or "than" with "differ" and "different".
98. Comparative estimates - multiple numbers.
The following are examples of multiple numbers: four times, three times, six times.
multiple + as + many/much + as
Fresh fruit costs twice as much as canned fruit.
He has half as many as he need.
Don't use "so" instead of "as" after a multiple; Don't use "more than" instead of "as many as" or "as much as"; Don't use a multiple after "as much/many";
