The object is a secondary part of the sentence which completes or restricts the meaning of a verb or sometimes an adjective, a word denoting state or a noun.
She has bought a car. I’m glad to see you.
WAYS OF EXPRESSING THE OBJECT
The object can be expressed by:
1. A noun in the common case or a nominal phrase, a substantivized adjective or participle:
I saw the boys two hours ago. The nurses were clad in grey.
First of all she attended to the wounded.
2. A pronoun (personal in the objective case, possessive, defining, reflexive, demonstrative, indefinite).
I don’t know anybody here. He says he did not know that. It has taken mine away ( my appetite). You should know all about it. What will you do with yourself?
3. A numeral or a phrase with a numeral:
At last he found three of them high up in the hills.
4. A gerund or a gerundial phrase:
He insists on coming. A man hates being run after.
5. An infinitive or an infinitive phrase:
She was glad to be walking with him.
6. Various predicative complexes:
She felt the child trembling all over. I want it done at once.
7. A clause (then called an object clause) which makes the whole sentence a complex one:
I don’t know what it was. He thought of what he was to say to all of them.