Learn English – Using “would” in the First Conditional

grammar

I know that the following sentence is correct:

If it rains, I will stay at home.

My question is if the following sentence is also correct when you are not so sure about what you are going to do:

If it rains, I would stay at home.

I've seen 'It wouldn't surprise me if it were true.'
Above sentence is using "would" instead of "will".
Is this a very special case? Or it is natural and means we can use "would" instead of "will" when we are not so sure?

Thank you in advance!

Best Answer

After looking it over a little, I found that using would makes your other verbs take passive tense.

Your example has the past tense were being used which is why would is used. In order to change it to use will you would have to say, "It will surprise me if it is true."

If it rain(s), I will stay at home. If it rained, I would stay at home.

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