Verb

English ( Master)

Title

45:30

8 of 24 completed

5 of 15 completed

38 of 100 completed

8 of 20 completed

Indian Economy - Understanding the basics of Indian economic system

Torrential rains and winds of upto 170 km per hour swept away roads, homes and bridges and knocking down power and communication lines.

knocking down

homes and bridges

swept away roads

winds of upto

Since the given sentence is in past tense, hence replace gerund (knocking) with 2nd form of verb (knocked).