If it ______ (rain) on their wedding day, a couple _____ (have) a happy marriage.
If it rains on their wedding day, a couple will have a happy marriage.
If a day _________ (be) Friday the 13th, it ____________ (be) considered unlucky.
If a day is Friday the 13th, it will be considered unlucky.
A wish ___________ (come) true if a person ___________ (see) a falling star.
A wish will come true if a person sees a falling star.