Keeping 'Then' and 'Than' Separate
The way to keep the pair straight is to focus on this basic difference: than is used when you're talking about comparisons; then is used when you're talking about something relating to time. Than is the word to choose in phrases like smaller than, smoother than, and further than.
Are Than and then homophones?
Then and than are homophones that sound alike but have different meanings. Then can function as an adjective, adverb, or noun.
Is and then grammatically correct?
A. No, yes, and yes. It's fine to write “and then” as you did in your first sentence. If you leave out and, add a comma before then: “He got a DUI, then resisted arrest.”
