* Missing Subject: The sentence lacks a noun or pronoun that performs the action of "cleaning". We need to know *who* needs to clean the room.
* Implied Subject: While the sentence is missing a subject, it *implies* that someone needs to clean the room. This implied subject is likely "He" or "Someone".
To make the sentence grammatically correct and identify the subject and predicate, we need to add a subject:
Corrected Sentence:
* He needs to clean his room today.
Subject: He
Predicate: needs to clean his room today
Explanation:
* Subject: The subject is "He" because it is the noun that performs the action of "needs to clean".
* Predicate: The predicate is "needs to clean his room today" because it tells us what the subject is doing.