The Direct Object.
The Direct Object may be:-
1. A Noun.
Lightning struck the temple.
2. A Pronoun.
Warn him.
3. An Adjective (used as a noun).
We must help the poor.
4. A Verbal Noun (or Gerund).
He practises wrestling.
5. An Infinitive.
I am learning to row.
6. A Phrase.
The agent promised to put things right.