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What is the grammatical role of a word like "Thus", "Therefore", or "So" at the start of a sentance?

I was born in the US. "Therefore" I am an American citizen.

It's not an article... it's not a preposition... is it a conjunction?

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closed as off-topic by tchrist, choster, Josh61, Ronan, Hellion Jul 21 '14 at 16:52

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What resources have you considered to try to answer this yourself? – curiousdannii Jul 21 '14 at 2:09

Thus and therefore are adverbs.

At the onset of a sentence So is generally used as an adverb or conjunction.

Adverb: So many played the lottery that the odds of winning were infinitesimal.

Conjunction: I wasn't feeling well. So I decided to stay home. (A better use would be to join the two sentences into one. It is getting late so I think I should head for home.)

While we are on the subject of so, it may also be used as an adjective.

Adjective: Perfections insist on things being just so.

Hope this helps!

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