if; should it be so, suppose it were so / But, As for, indeed.

If it's not Sunday it's Monday. (If to-day will not, to-morrow may.)

If the wife is of good disposition, good will accrue.

If the daughter-in-law be black, the whole family will be blackened. (literally, "a bad daughter-in-law will bring disgrace on her husband's family")

The sister is ours, but is the sisters's husband ours also?

If that be a village, will the cocks not crow? Applied to "the evidence of a fact".

The builder (of a house) is one and he who lives in it is another.