By then we had been over the story so many times I knew exactly how they wanted me to answer nearly every question.
By then you'll be strong enough to hold down a job.
I was away at college by then, however, and never got to hear him.
By then, everyone will have moved on to something else.
Problem is, he might be way past his best by then.
We need to be gone by then went without saying.
I had not been a child for several years by then.
But by then, a lot of other things had happened.
He won't be able to drive his car by then.
Never know, you might have a full time job by then.