how to say "should" in swedish?
how to say the word "should" in swedish? is it "ska"? "bor"? "borde"? and what the difrences between each word?

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and theres no diffrences between all those words?

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Skulle; borde, bör 
Du skulle (borde, bör) gå till läkaren --> you should see a doctor

how should I know? --> hur ska (skulle) jag kunna veta det?

they should be there by now   --> de borde (bör, torde) vara där nu, de är nog där nu