if it rain vs if it rains

Some examples from the web:

• What if it rain again, Remy?
• If it rain, you look for me.
• For example, if it rains on a holiday, forget about picnics.
• If it rains now, we have to start over.
• If it rains, you can always buy an umbrella in Cuba.
• If it rains, we can return to that day again.
• Six inches of mud if it rains.
• If it rains here they'll breed.
• We'll take a taxi if it rains.
• If it rains, it's bad weather.
• I will go cycling even if it rains.
• I will go cycling even if it rains.
• If it rains tomorrow, I'll stay at home.
• The game will be called off if it rains tomorrow.
• Even if it rains, the game will be played.
• The game will be played even if it rains.
• If it rains now everything would get wet.
• If it rains, you should not worry.
• In that case, if it rains, a mandatory procedure should be repeated.
• Queenie says if it rains today it will rain for forty days after.

Some examples from the web:

• The game will be called off if it rains tomorrow.
• For example, if it rains on a holiday, forget about picnics.
• Mr Shannon, I'll find a dry spot if it rains.
• If it rains here they'll breed.
• Gunther said that even if it rains it will end no later than the end of August.
• If it rains you'll be the first to know.
• I will go cycling even if it rains.
• I will go cycling even if it rains.
• Even if it rains, the game will be played.
• The game will be played even if it rains.
• Besides, if it rains, she won't be able to ride home after dinner.
• (Clears throat) if it rains... it won't.
• And if it rains, don't go out at all.
• And if it rains we'll go to town or to the cinema.
• Because if it rains, then we won't be able to see the comet.
• Doesn't matter if it rains a little, you have a windshield wiper.
• Yes. And if it rains, there is the security hut itself.
• I have to go even if it rains cats and dogs.
• Dry if it rains, only one way in.
• But if it rains really hard, don't let them go.