Little more about if condition

When you come across the "if" word in any sentence, then be careful about the following about the sentence schema:
If Clause Then Clause
Present will + Base(Main) verb
If Roger win, he will be the first person to win 5 US open successively.
Past would/ could + Base(Main)verb
If Avix failed ...... , he would go .........
Past perfect would/could + have + Participle
If Napoleon had conquered ..... he would have given a new ..........


Please be careful while writing and using "If" condition and keep above simple rules in your mind. We've a tendency to use excessive usage of would/ could but sometimes they are not at all required!