If we reduce the amount of water under the sun, it will evaporate.
Error: "reduce the amount of water under the sun" is not a realistic condition.
Corrected: If we leave a bowl of water under the sun, it will evaporate.
Unless we leave a bowl of water under the sun, it will evaporate.
No error.
If I am 10 centimeters taller, I would play basketball.
Error: The conditional clause should use the past subjunctive tense.
Corrected: If I were 10 centimeters taller, I would play basketball.
If the doctors could find the remedy, a lot of people would be saved.
No error.
If she bought that house now, she ran out of money.
Error: The conditional clause should use the past subjunctive tense, and the main clause should use the past perfect conditional.
Corrected: If she had bought that house now, she would have run out of money.
What would you do if you could speak French well?
No error.
If I had known he is not at home, I wouldn’t have gone all the way to his house.
Error: The conditional clause should use the past perfect tense.
Corrected: If I had known he was not at home, I wouldn't have gone all the way to his house.
If I had known that the road were flooded, I would never have taken that way.
Error: The conditional clause should use the past perfect tense, and the main clause should use the past perfect conditional.
Corrected: If I had known that the road was flooded, I would never have taken that way.
If I were you, I will go to the dentist's and have the tooth checked.
Error: The main clause should use the conditional tense.
Corrected: If I were you, I would go to the dentist's and have the tooth checked.