(Even) if the sun were to rise in the west,
he couldn't [cannot] beat the champ.
We would [will] postpone the plan, if it
should rain tomorrow.
We will postpone the plan, if it rains
If you were to see a UFO, what would you
Though we've never suffered from a big
earthquake in this area, if one should occur, we could do
nothing about it.
If I were to tell your mother what you
are, what great shock will she get?
As I've checked the document three times,
I'm sure it's perfect. But, if you shouldn't be satisfied
with it, please do not hesitate to tell me.
I will travel in America.
⇒ I wrote that I would travel in America.
⇒ I was going to travel in America.
Tom should do it soon.
⇒ Father shouted that Tom should do it soon.
⇒ Tom had to do it soon.
He must study hard.
⇒ He knew that he must study hard.
⇒ He had to study hard.
The boy must be a genius.
⇒ People said that the boy must be a genius.
⇒ The boy must have been a genius.
She can swim.
⇒ She told me that she could swim.
⇒ She could swim then.
His story cannot be true.
⇒ I thought that his story couldn't be true.
⇒ His story cannot have been true.
I may go home earlier.
⇒ My boss told me that I might go home earlier.
⇒ I could go home earlier.
＜東京 新宿 ＞