Many people believe that morning exercises do them a lot of good.
He thinks that it will rain tomorrow.
We know that we have missed an opportunity and that it may never come again.
I am in good shape because I used to do a lot of exercises.
He says that they are working on a new model of Boeing(波音飞机).
Scientists have studied the universe ever since telescope was invented.
Centuries ago,people held a belief that the sun moved around the earth.
He thought that it would rain the next day.
He had done all that was necessary.
By the time they found the hacker,he had already broken into the computer system of the bank.
I got the job because I was a good driver.(并不表示我现在就不是好司机)
I wanted to join the police,but I wasn’t tall enough.(不表示我现在就高了)