"Than" or "as"

1. Use than when comparing two things that are not equal. Use than after the adjective. 

Example

Jerry is more interesting than Terri.

2. Use as when comparing  things that are equal. The structure is  as...as. 

The adjective or adverb will be in between as and as. 

Example

Jerry is as interesting as Terri.

3. Use not as when comparing things that are not equal.  The structure is not as...as.

Example

Jerry is not as interesting as Terri.

4. Use as much as when comparing quantities and uncountable nouns. 

The structure as much... as is used when uncountable nouns are equal. 

Not as much...as when uncountable nouns are not equal. 

The uncountable noun will be in between much and as. 

Example

Terri has as much experience as Jerry. (equal)

Terri does not have as much experience as Jerry. (not equal)

5. Use as many as  when comparing quantities and countable nouns. The structure As many... as is used when countable nouns are equal. 

Not as much...as when countable nouns are not equal. 

The uncountable noun will be in between many and as. 

Example

Terri does as many tasks as Jerry a day.

Jerry does not do as many tasks as Terri a day.