The impact was such that the canine flung into the air and fell into a drain five meters away.
In above sentence should we use was flung or only flung?
I think flung is transitive because to flung something we need an object. Hence it should be *canine was flung" is correct. It should be a passive sentence construction.
"Fling" used to mean "throw or hurl forcefully" is a transitive verb, so that "was flung" is needed when discussing the fate of the dog. There is an intransitive use of the verb, meaning (of a person) to "go quickly and angrily", e.g. "after the argument, Peter flung out of the house", but this is not the meaning in your text.
Some English verbs
work with both 0 and 1 objects
if 0 objects are specified, the meaning is the subject did, or appeared to do, the activity to him/her/itself, or "something made" the subject do the activity
The impact was such that the canine flung into the air and fell into a drain five meters away.
This is equivalent to saying "The impact made the canine fling into the air."
Saying "The impact flung the canine into the air" is also OK.
Verbs that don't work like this require passive voice, and you could still use passive voice here if you wanted as well.
The impact was such that the canine was flung into the air and fell into a drain five meters away.
