Final answer:
The literary device present twice in the sentence is personification, where the moon 'going off watch' and the darkness 'blanketing' the river both attribute human actions to non-human entities.
Step-by-step explanation:
The literary device that can be found twice in the sentence "I see the moon gooff watch and the darkness begin to blanket the river" is personification. Personification is a literary device where human qualities are given to objects, animals, or concepts.
In this example, the moon is described as if it can 'go off watch,' which attributes a human action to a non-living entity, and the darkness is said to 'blanket' the river, which similarly gives the darkness a human-like ability to cover or envelop something.
In the sentence "I see the moon go off watch and the darkness begin to blanket the river," the literary device of repetition can be found twice. The repeated words are "the moon" and "the darkness." This repetition emphasizes the image of the moon leaving its position and the darkness covering the river.