Question

This assignment must be finished _____ Friday afternoon.
Options :
by


of


at


on

Answer 1

This assignment must be finished by Friday afternoon.

What is a preposition?

• In English grammar, we can simply describe prepositions to be words which link the  words in a sentence to one another. In this way, they play an important role is generating the correct sentence structure.

Why the preposition 'by' is used?

• We often use the preposition to depict 'not later than' situation. For example, in the sentence above, the assignment has to be submitted not later than Friday afternoon. So, we will use the preposition 'by' to fill in the blank.