100 mistakes not to make

89. Than and as 

Object pronouns (me, him, her etc) can be used after as and than, especially in an informal style. 

• She is taller than me. 

• He earns as much as her. 

• She doesn't sing as well as him. 

In a formal style, we prefer subject + verb after as and than 

• She is taller than I am. 

• He earns as much as she does. 

• She doesn't sing as well as I do.

 Note that a subject form without a verb (e.g. than I) is unusual in this structure in modern English. 

• He ran as fast as me. 

OR He ran as fast as I did.

 (More natural than ‘He ran as fast as I’.)