Could you please clarify what you mean by "Is All the subject"? It seems like there might be some context missing. If you're asking about whether "all" can be a subject in a sentence, then yes, "all" can function as a subject when it refers to a group or collective. For example, in the sentence "All are welcome," "all" serves as the subject.
A subject and a predicate
subject noun
all technical subject comprizing of integrated technology
"All visitors to the factory" is the complete subject.
No
The simple subject is "daughters."
"All is well" is not a sentence fragment because "All" is your subject and "is" is your verb. In a complete sentence contains a subject and a verb.
If the subject at all, many babies would be the complete subject and babies the simple subject.
labeling all files, removable media and subject headers
Do your homework and study for all the tests.
First, find the subject of the sentence. In this case, the subject is "all," which is a plural subject. It refers to a group-- All boys; all girls; all Americans, etc. But I know what is confusing: "of the class." The short answer is, don't worry about it. Any time you see words like "of", "in", "to", "with," etc, these are all prepositions and this means there's a prepositional phrase coming. Examples: of the class, in the room, at the bus stop, with my friends...-- these are all prepositional phrases. The reason I am mentioning this is a prepositional phrase cannot be the subject of a sentence. For example: the color of his eyes is blue. (Eyes is not the subject. Color is the subject. As for "eyes," it is part of a prepositional phrase-- "of his eyes", and it cannot be the subject. If there were no prepositional phrase, you could say His eyes are blue.) So, just make the prepositional phrase vanish, and you have the subject all by itself. Thus, All (ignore "of the class") are good.
the combination of all the subject