10:25pm was the time I picked up Joannie from the station.
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.
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."
Once upon a time...
Once upon a time ..............................
It is high time that you began the lunch plans.
yes
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.
Yes, I can start a sentence with "Is."