Question

My mother is ill ........fever(fill in the blanks with appropriate preposition )

Answer 1

My mother is ill OF fever.
..It may help.

Answer 2

Answer:

My mother is ill WITH fever.

The part of speech which talks about relation between two things in a sentence is called Preposition. A "preposition" is a word normally placed before a Noun (or a pronoun) in order to express the relation it had with the other element in the given sentence. In the given sentence, it tells about the time and location of two things. It also helps to form a relation between them. Therefore, in the given example “with” is a preposition which tells that the person was ill due to fever.