Final answer:
In French, 'they lie' is translated as 'Ils mentent.'
Step-by-step explanation:
Ils mentent.
In French, to say 'they lie,' you use the verb 'mentir' which means 'to lie.' The subject pronoun 'Ils' is used to represent the plural form of 'they.'
For example:
'Ils mentent toujours.' means 'They always lie.'
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