To quote from Charles Dickens' A Tale of Two Cities: 'It was the best of times, it was the worst of times....' So obviously 'It' can start a sentence.
Yes. There is no word that cannot begin an English sentence.
The word 'is' can begin a sentence but not be a question when it is the subject of the question. Example sentence - Is can be the subject in a sentence. But only in sentences of that type (above) or, 'Is' is a two letter word. Otherwise is cannot begin a sentence.
Good question! But heres the answer: A sentence can begin with eg such as 'Eggcups are for holding a boiled egg',but a sentence can also begin with e.g such as: e.g is the abbreviation of 'for example'.
In this sentence, 'when' is an adverb; 'you begin when'.
It is possible to have a sentence with the word it at the beginning, as this sentence proves.
Therefore, because it is not improper, one may begin a sentence with "therefore."
Yes
yes
Yes.
No
I will now begin the demonstration. Let's begin at the beginning.
Yes, but you have to say the name somewhere in the sentence