Learn to guess a reason with -어서인지 and to ask or guess indirectly with -는지, and see how the two are different.
By the end, you can use -어서인지 to say "maybe because…" about a fact you know, and use -는지 / -(으)ㄴ지 / -(으)ㄹ지 for indirect questions and for guesses based on what you see.
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