Question

Where is the gerund and it's used
Telling lies is a great sin .

Answer 1

Explanation:

The plural for “lie” (the noun) would be “lies” (which is also the present tense, third-person singular form of the verb), but you probably meant to ask what is the spelling for the gerund/continuous form, which would be “lying” (not “lieing”). Someone graciously edited the question for you, but I have no indication or confidence of whether you, the OP, have even read this answer, which excellently answers your question, by the way.

Below are examples of how to use the noun and verb forms. Although the gerund acts like a noun, it is formed from the verb, a chimera of sorts.