The point of this lesson was to learn to conjugate a verb like 'mentir' ( to lie).
If you look at the examples given you have to agree the 'je' form with the correct part of the verb which is 'mens'.
I know it is tedious but conjugations are an integral part of learning how to use verbs correctly in all Latin based languages including French.
It's "mens". You can look up conjugation on Wiktionary and other websites.
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