The words Then and Than sound the same and they sort of look the same. But that is where their similarity ends. They have completely different meanings. The word Than is used for comparisons, such as "He'd rather run fast than well, and "My invention is more exciting than anything the world has ever seen." The word Then is used in relation to time, such as "And then what happened?" and "Jackson could see an open space just beyond; and then the woods seemed to be thicker and darker.
The word Than is used for comparison. Both the word than and the word comparison have the letter "A" in them. No E's to be seen anywhere. So now when trying to decide which to use when comparing one thing to another such as "An apricot is larger than an ant," you use the word with the "A" because the sentence compares one thing to another.
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