Seeing the tiger, the man ran away.
I'd like to know whether 'seeing' is gerund or participle? may be explained.
Seeing the tiger, the man ran away.
I'd like to know whether 'seeing' is gerund or participle? may be explained.
It is a participle. A participle functions (externally) like an adjective; the word seeing describes and modifies the man in your example, so it is a participle.
Separating the participle from the noun it modifies by a comma, as in your example, is called apposition.
A gerund functions like a noun; if it were a gerund, then it would be hanging in the air in your example. You can test this by replacing it with a somewhat similar noun:
The action of seeing the tiger, the man ran away.
This doesn't work. (And don't add prepositions before the gerund to make it work: that's cheating!)
Tiger-aware, the man ran away.
As you see, it works if you replace it with an adjective, so it is a participle.
This participle construction is a shortening for a clause with when/as.
1 - When/as he saw the tiger, the man ran away.
2 - when seeing the tiger, ...
3 - Seeing the tiger, ...
Temporal or causal clauses can be shortened by using participle constructions. Occasionally other kinds of clauses, too.