You can start a sentence with 'at this time'. Here is an example:
At this time, the young man leapt into the air and flew off towards sunset.
This is a transitory phrase and helps keep track of time in your writing. It does tend to make your writing wordier than it needs to be.
A simpler phrase to use instead could be 'now' or at...(specific time indication).
Between a rock and a hard place, that's where I'm at.
Between you and me, something's rotten in Denmark.
yea you can
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.
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.
Finally, the time has come to start anew and shine
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
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!
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."
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.