is the correct phrase

what lay ahead


what lies ahead ?
Hi Anon

Both are correct, but they are different tenses:

what lay ahead => past simple form of the verb "to lie"

what lies ahead => present simple form of the verb "to lie"
What lies ahead.
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 Yankee's reply was promoted to an answer.
well it depends on wether you are speaking in the past ( in which case it's lay ahead)

or the present ( in which case it's lies ahead).