Case marking: noun words الإعراب

In Arabic, as in other languages, the grammatical environment affects the form a noun takes. In other words, concepts can be expressed in different word forms. For example, in English, there exists “I” vs “me”, “he” vs “him”, “she” vs “her”, “we” vs “us”, “they” vs “them” and “who” vs “whom”. Although “I” and “me” refer to the same person, and “she” and “her” also refer to the same person, the different forms are not interchangeable; it would be grammatically incorrect to say:

*Me spoke to she

or

*Her gave it to I

The corrected versions are:

I spoke to her

and

She gave it to me