They started as same word, but their meanings have drifted apart over time.
A simple way to keep them apart. (Most of the time.)
'Between you and __'? Simple guidance for a tricky pronoun.
Is it all the same anyway?
Many of today's grammar rules can be traced to the opinions of one 18th century writer.
The awkward case of 'his or her'
Why does it sound strange to say 'funner' or 'funnest?'