Question

This train is bound...... Delhi

Answer 1

This train is bound to Delhi .

Answer 2

The sentence after filling up the blanks is following – This train is bound to Delhi. Here “to” is used to make this sentence as a meaningful one.

“To” is a preposition. Prepositions are generally used to link up with pronoun, nouns, phrases within any sentence.

It can be referred as the word usually preceding any pronoun or noun and expressing the relation to other.