Where is the predicate in the sentence: "السماءُ صافيةٌ"?

Choose the sentence that contains a correct subject and predicate:

What type of predicate is in the sentence: "الطالبُ في المدرسةِ"?

Choose the sentence where the predicate is a verbal sentence:

What is the suitable subject for the predicate "ماهرٌ"?

Choose the sentence that contains a semi-clause predicate:

What is the grammatical analysis of the word "نظيفٌ" in the sentence "البيتُ نظيفٌ"?

Choose the sentence that includes a recently placed subject:

What is the type of the subject in the sentence "المجتهدون ناجحون"?