A single sentence is the simplest and most basic sentence with only one predicate; a main sentence is a single sentence that can exist independently; a clause is a sentence that is attached to the main sentence and serves as a component of the sentence; a complex sentence is a sentence that consists of two or more independent clauses, with logical relationships between the clauses and sharing a subject or each having a subject. Definition of single sentence: A single sentence is "the simplest sentence and the most basic sentence". Its most prominent feature is that it has only one predicate, which reflects the "space-time exclusivity" of the sentence.
Main clauses and single and complex sentences can be understood through the following illustrations and explanations: Main clause and main clause: are sentences that can exist independently. Their structure is the most basic "main system table" or "subject predicate object" pattern, with a unique predicate verb, that is, the unique attribute of time and space. For example: Clauses: cannot exist independently, must be connected to the main clause through leading words and rely on the main clause. Clauses can be embedded in the main sentence to replace or modify the subject and object elements of the main sentence.

The main sentence is the body of the sentence, which exists independently and expresses the main information. Clauses are structures embedded in the main sentence and need to be attached to the main sentence to add rich connotation to the sentence. A single sentence has only one predicate verb, which is concise and direct. Complex sentences contain multiple verbs, showing multi-level thinking collisions.
The main sentence is a sentence that can express the complete meaning independently. It contains the basic structure of "subject, system and table" or "subject, predicate and object". The main sentence is the core part of the sentence and can exist independently without relying on other sentences. For example: "The news made us very happy." (We are very happy with the news.) This is a main sentence that independently expresses the fact that the news makes us happy.
Guide words: Although both noun clauses and attributive clauses use conjunctives or relative words to guide, their guide words are different, and the role of guide words in the clause is also different. Deletion test: After deleting the clause, if the sentence is still complete and clear, it may be a noun clause (especially when the clause serves as an object or predicate); if the sentence becomes incomplete or ambiguous, it may be an attributive clause.
Define different noun clauses: Clauses that function as nouns in complex sentences are called noun clauses. Attributive clause: A sentence that is modified and qualified after a noun or pronoun (antecedent) is called an attributive clause. In layman's terms, a clause acts as an attribute in the entire sentence, and this clause is called an attributive clause. Noun clauses with different scopes are a general term, which includes subject clauses, object clauses, predicative clauses and appositive clauses.
Attributive clause: It has a close modifier relationship with the antecedent, usually immediately following the antecedent. Noun clauses: Especially appositive clauses, although similar in form to attributive clauses, do not modify the antecedent, but provide a supplementary explanation to the antecedent. This supplementary explanation does not change the subject-predicate structure of the sentence. To sum up, there are significant differences between attributive clauses and noun clauses in terms of function, use of connectives, and relationship with antecedents.



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