starting a new sentence with therefore is allowed, provided it is a continuation sentence.
example: We went to Paris for vacation this summer. The kids wanted to see the Eiffel Tower and taste the Croissants. Therefore, we went to the bakery to get the croissants and then to the Eiffel Tower.
Yes, but it depends on which context it's used in.
And is a coordinating conjunction; therefore it should never begin a sentence. Ironically, though, the preceding sentence is correct because and is used as a word, not as a conjunction.
With the exception of not capitalizing the 'y' at the start of the sentence, it is a correct sentence.
Of course you can.
yes
To start with ME, not myself.
A correct answer would be yes.
He's bit the apple. This is a correct sentence (don't forget to start a sentence with a capitol letter).
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
The correct sentence form is: Abby whispered, "The movie is about to start."
The correct punctuation for the sentence "In September you and him get to start going to middle school" would be: "In September, you and he get to start going to middle school."
The correct way to start a sentence with a number is to spell it out... For example... 'Three people were injured' is correct while '3 people were injured' is not.