If it rains tomorrow, we won't go for an autumn outing.

If there is no air in the world, mankind will perish.

Without green leaves, there would be no fragrance of flowers.

If you don't adopt it, I won't get any marks.

Without your help, I wouldn't have succeeded.

Without the hard work of migrant workers, there would be no prosperity in this city.

If there is no great sun, there will be no beautiful and lovely world.