This group of words is not a complete sentence, it is a fragment.
What is a sentence fragment?
A sentence fragment is a clause that lacks one of the three necessary elements for a complete sentence: a subject, a verb, and a complete thought.
The group words mentioned in the question is not a complete sentence because there is lack of one of the three necessary elements for a complete sentence: a subject, a verb, and a complete thought.
The complete sentence could be "Since you will not be at school tomorrow, I would like you to know that on Friday, we will be studying vocabulary".
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