Yes, but it would have to be quoted.
ex. "At which time should I come over?"
Yes, it is grammatically correct to start a sentence with "At which time," followed by the main clause. For example, "At which time the meeting will start remains unclear."
Yes, I can start a sentence with "Is."
"Did you finish your homework?" "Where is the nearest grocery store?" "What time does the movie start?"
No it won't, unless it is at the start of a sentence.
Well that is a tricky question but i would say at the start of a sentence people would often use "I" at a start of sentence. There is loads of words to start a sentence so i can't tell you all of them obviously. example: "I" went to the shops to buy sweets.
Yes, you can start a sentence with "where," such as "Where did you go yesterday?" or "Where is the nearest grocery store?"
InterrogativeA complete sentence
Yes, you can start a sentence with "By" By, the time I waited in line two hours for my ticket, the show was over.
Once upon a time...
Once upon a time ..............................
It is high time that you began the lunch plans.
yes
10:25pm was the time I picked up Joannie from the station.
At a certain point in time, I was actually considering going out with him!
Of course. "At the time of William Henry Harrison's inauguration, the weather was cold."
No unless the sentence before takes up the whole line.
No, you cannot start a sentence with "no" unless you need to do so. No reason exists not to start a sentence with that word, as you can see. No one will care if you do start a sentence with it.
No reason why not - if writing a sentence you may put a comma after the word. 'Generally, it does not take much time'