I am four words
Though there appear to be three
Two ways of pronouncing
Three spellings there be.
The first is a manner of indicating, a case being such, or therefore, or a measure of degree.
The second is a pig, female you see.
The third is also on a farm, a manner of planting of seed.
The fourth is to stitch, to hold fabric together, indeed.
Can you tell me now, what words could this be?