Explanation
Who is telling a lie is an interrogative sentence of Present Continuous Tense.
Who is telling a lie means کون جھوٹ بول رہا ہے
Who means کون
Tell a lie means جھوٹ بولنا
Present Continuous Tense
Active Voice: Subject + is/am/are + First of verb + ing + obect.
Passive Voice: Object + is being/am being/ are being + third form of verb + by + subject.
