Learn Arabic (Modern Standard): إن التضارب في العمل خطير. - Indeed, the conflict at work is dangerous.

The word التضارب comes from the root for hitting or striking. It is built using the Form VI verb pattern, which adds a reciprocal meaning. So, the concept of 'hitting each other' evolves to mean a clash, inconsistency, or conflict.

What case endings do the subject and predicate take here?

Because the sentence begins with the emphasizing particle إن, the subject التضارب is in the accusative case, taking a fatha. The predicate خطير remains in the nominative case, taking a damma (specifically dammatayn since it is indefinite).

Why does the Arabic text use في (in) for 'at work'?

In English, we say 'at work' or 'at school' as a general state, but Arabic expresses this as being 'inside' the activity or location. Therefore, you must use في (in) combined with the definite noun العمل (the work).

Could خطير mean something other than physically 'dangerous' in this context?

Yes. While خطير means physically dangerous, in professional or abstract situations like a conflict at work, it is frequently used to mean 'serious', 'grave', or 'critical'.