I will therefore relate the events of our first encounter with the Sasquatch.
Therefore, because it is not improper, one may begin a sentence with "therefore."
No it is not a complete sentence on its own. It is because there should be something before Therefore.
I can't do this therefore my mum plays piano
yes
'As soon as' is a conjunction and not a complete sentence. Therefore it can not be classified as a sentence.
His beloved dog had just died, therefore he was depressed.
I am allergic to dogs, therefore we are not getting one.
i live in a house, therefore i am not homeless.
The 'sentence' is not a question, therefore there is no answer.
this is my home work, therefore I need to do it at home
she had diabetes, therefore, she could not eat sugar
this is my home work, therefore I need to do it at home