“Than” compares things, and “then” describes something that happens at a later point in time. They sound similar and were even written the same way until the 1700s. But not anymore, thank goodness!
“Than” shows a comparison and is sandwiched on both sides by other words.
“Than” also appears in well-known idioms.
Problems arise in English when a pronoun follows “than.” Is it "She is taller than I" or "She is taller than me"? If you use "taller than I," you are correct! Because of the 'invisible' verb in "She is taller than I (am)," you use "I" and not "me." (If that sounds a bit confusing, don't worry. Over the years, it has become common to save the phrase "taller than I" for formal texts and to use "taller than me" informally.)
Now let's talk about "then." It’s not there to compare anything; it just moves things forward. “Then” can be used like "next," "at a particular time," or "in that case." In the case of the last meaning, it often comes after "if," as in, "If we write about cats, then we must write about dogs."
A few more examples:
That's it for now on the subject of "than" vs. "then," and to sign off: this lady would have been better off reading our article BEFORE her tattoo appointment.
"A love thicker, then blood"
It should actually read, "A love thicker than blood." Well then, that’s quite embarrassing.
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