If I had known that the road were blocked, I would never have taken that way.

            A                                   B                C                    D

If the weather weren’t nice, we would go on a picnic.

You should run into Mark, tell him he owes me a call.

if she bought that car now, she ran out of money.

Out into the street the thieves ran.

Unless I won a huge prize in lottery, I wouldn’t give off my job.

What a pity! Had I been there on time, I would not miss the performance last night.

No longer does my teacher teaches in this school.

Water would run downhill if there were not gravity.

If you send the application form to our school, you would have been offered a scholarship.

            A               B                C                                                 D

Unless it did not rain, Ngoc would pay US a visit as soon as possible.

If the doctors could successfully develop to the vaccine, a lot of people would be saved.

If Lucy had finished her task, she can go home.

If I known you were in trouble yesterday, I would have_tielped you.

If Mary had been here now, she would discover the truth about your lies.

When Linda can speak three languages whereas I can only speak Vietnamese.