So and sew are homophones in English and are often confused; they are both pronounced /soʊ/ but have different spellings and their meanings are completely different.
so

So has a number of meanings and is used in various set phrases and idioms, only a few of which are shown here.
So can be an adverb.
You can use so in front of adjectives and adverbs to emphasize the quality that they are describing.
He was surprised they had married–they had seemed so different.
I was so sorry for what I had done.
You can also use so to refer back to something that has just been mentioned.
‘Do you think that made much of a difference to the family?’—’I think so.’
In addition, you can use so when you are saying that something which has just been said about one person or thing is also true of another one.
They had a wonderful time and so did I.
So can also be a conjunction.
You use so and so that to introduce the result of the situation or the reason for doing the thing you have just mentioned.
Duvet covers are usually made from cotton, so they can be easily washed.
He took her arm and hurried her upstairs so that they wouldn’t be overheard.
sew

Sew is a verb.
When you sew something such as clothes, you make them or repair them by joining pieces of cloth together by passing thread through them with a needle.
She sewed the dresses on the sewing machine.
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