The expressions they use might whom they are speaking to or how well they know each other.
_______the sun was not yet up, many people were already taking exercise in the square
—Jim, remember to return this book by Friday.—_______.
Mr. Wang has left for Guangzhou. He ____ a speech there in two days.
If my frirends have any problems, my door is ______ open to them.
As time____, you'll come to think of English as your friend and love it.