Question

he is expert in telling lies. begin : his

Answer 1

His expertise in telling lies is known to all

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Answer 2

The answer is: his expertise lays in telling lies. Here the now form of the adjective expert has been used in order to start the sentence with he.

This is the way to change the sentence and its structure according to the instruction without changing its inherent meaning.

The subject verb agreement is well maintained here but in the original sentence the subject was he, in the modified sentence the subject of the sentence is his expertise.