There are still some English  words with "sk," like "skirt," and "skull," but they're direct borrowings  from Old Norse that came after the "sk" to "sh" shift.
Některá anglická slova mají stále "sk" jako "skirt" a "skull", ale to jsou slova vypůjčená ze staré norštiny, která přišla až po posunu z "sk" na "sh".