A simple, one sentence riddle which I'm confident will **** your brain sideways.
I have another part and may be started many different ways, though three of which can be completed by changing letters.
What is it?
The title is an example.
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I have a possibility. Is it,
A question can be started as such: who, what, when, where, why, *how, etc. The other "part" may be the answer. Who can be converted to Why by changing one letter, and Who is an anagram of How. Who, Why, and How may be the ways of starting that can be achieved by "Changing letters".
"Completing" the start of a question is it's pairing with the corresponding answer. We have the substitution w --> t for three: What? That. Where? There. When? Then.
I have another part (of speech)-an interjection. Five parts can be completed by reducing straight lines into line segments or points: Pronoun-I, Verb-WILL, Noun-TILL, Article-AN, Conjuction-IF.
I think of a:
I have another part
may be started many different ways
What, when, why, where, how, can...
though three of which can be completed by changing letters
What, When, and Where can be completed (answered) by changing the W into a T, creating That, Then, and There