Question

Diana set the alarm clock ___ six o’clock

Answer 1

Diana set the alarm clock at six o’clock

Answer 2

Diana set the alarm clock at six o’clock.

The term “at” is a proposition.

These kinds of words are used before pronouns or nouns.

These words clearly show the link among pronoun or noun and also other words present in the given sentence.

They also introduce the information to people.

It includes where the actions take place, why or when anything takes place.