They are talking about a young pop star now.
They talk about a young pop star now.
They have been talking about a young pop star now.
They will talk about a young pop star now.
_________ his assistance in those days, I would not be so successful now.
Unless I had
If there were not
If it had not for
Had it not been for
" If I hadn't practiced when I was young," he says," I __________able to play now."
won't be
would be
wouldn't have been
wouldn't be
If energy ___ inexpensive and unlimited, many things in the world would be different.
is
will be
would be
were
_____ today, there would be nowhere for them to stay.
Were they to arrive
If they arrive
Had they arrive
Provided they arrived