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Which is correct? Therein lies the problem. or, Therein lays the problem.
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Therein lies the problem is the correct expression.

The Microsoft spell checker sometimes suggests lays, but this does not sound right to the ear! The spellchecker can get a bit befuddled like this sometimes.

If the problem occurred in the past you would say Therein lay the problem.

- Nick
Therein lies the problem
Students: We have free audio pronunciation exercises.
Microsoft Word lies, and therein lies the problem!
Lie is a tricky word and it gets confusing when you are using the past simple or past participle versions of it. The following categorization might help your possible confusion.

Present, past simple, Past Participle

1. lie: not telling the truth lie, lied, lied
2. lie: become horizontal lie, lay , lain
3. lay:put lay, laid, laid

Hamid

Should it be lies, lays of lay?

Behind every loss, every out, every win, and every pitch lays Chris’ enduring spirit and my own courage to take charge and begin again.

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olive book 93

Should it be lies, lays of lay?

Behind every loss, every out, every win, and every pitch lays Chris’ enduring spirit and my own courage to take charge and begin again.

It should be 'lie'. Because of the locative inversion, the subject occurs after the verb here, and it's a compound subject.

Chris's enduring spirit
and
my own courage ...

lie behind every loss, ....

There's no direct object, so you can't use transitive lay (present tense).

You can, however, use the past tense of 'lie' (lay) if this is supposed to be a past-tense sentence.

But 'lays' is definitely wrong no matter how you analyze the sentence.

CJ