Foreshadowing is the literary technique that is used to make predictions about the events that would still occur in a work of fiction by making use of hints.

As a result of this, an author can make use of some elements such as:

Dialogue
Motifs
Symbols
Metaphor, etc

Please note that your question is incomplete and therefore i am giving you a general overview that should help you arrive at the right answer.

Mood is the general feeling that a reader gets when reading a literary piece.

As a result of this, an author can make use of descriptive words to show the mood of an impending danger. Some sentences that can display this are:

"Remember the terrible event that occured two years ago? It could happen again!"
"I don't want my daughter to find out I am not her real father as she could run away!"