Converse of object

• follow: On the following forenoon we anchored in the Forth.

Preposition: at

• eleven: Letters from London and Worcester arrive every afternon at half-past one and are despatched every forenoon at half-past eleven.

Adjective modifier

• whole: No longer content to pay a flying visit, it was the whole forenoon that he dedicated to his solitary friend.

Modifies a noun

• watch: At 8 o'clock that morning I was back down in the engine room for the forenoon watch.