If the weather ... good next weekend, we ... (stay)
Sửa: If the weather is good next weekend, we will stay.

Come on! If we ... the bus, we ... (hurry/catch)
Sửa: Come on! If we hurry, we will catch the bus.

There ... too much litter in the streets, the environment will become polluted. (be)
Sửa: There is too much litter in the streets, the environment will become polluted.

If there ... big floods every year if the cutting down of trees continues. (be)
Sửa: If there are big floods every year, the cutting down of trees continues.

If the sea level ... (rise)
Sửa: If the sea level rises, many coastal cities will be submerged.

They will be late for the meeting if they ... the plates. (drop)
Sửa: They will be late for the meeting if they drop the plates.

If you aren't careful, you ... me, please tell them I'm out. (phone)
Sửa: If you aren't careful, you will phone me, please tell them I'm out.

If anyone ... with pesticides, they will become edible. (not use)
Sửa: If anyone doesn't use pesticides, they will become edible.

If crops ... (spray/destroy)
Sửa: If crops are sprayed, they will be destroyed.

If he ... too much pesticide on vegetables, they will become edible. (not use)
Sửa: If he doesn't use too much pesticide on vegetables, they will become edible.

If you ... (be/you-do)
Sửa: If you were here, you would do it.

You would feel better if you ... (take)
Sửa: You would feel better if you took a rest.

If she ... two years older, she ... (be)
Sửa: If she were two years older, she would be able to drive.

They ... angry if you didn't inform him. (be)
Sửa: They would be angry if you didn't inform him.

I ... disappointed if I ... lazy like this. (not be/not be)
Sửa: I would not be disappointed if I were not lazy like this.

What ...? (happen/disappear)
Sửa: What would happen if the ocean disappeared?