It was time to go to bed.
"What time is it?" John asked.
From time to time I will eat an orange.
Bill Clinton was our president at that time.
At this time you may leave the classroom.
If you like
To express time!
I know what time it is
I was on the spot at the time appointed! I was amazed at the time delay.
No, "lots of time" is not a complete sentence. It is a noun phrase that needs to be part of a larger sentence to make grammatical sense. For example, "I have lots of time to finish my assignment."
If you only use a word "once" in sentence, it only appears one time.
I use an egg timer to time how long I cook my eggs.
you use time connectives at the beginning of the paragraph and the middle as well you can use them at the start of a sentence.
Example sentence - The teams will converge on the hill at the same time.