What is the difference between a definite clause and a non definite clause?

If it is a definite clause, there must be a antecedent, and as for what is a antecedent, it is like the girl in your example, which is a noun and is also modified. Like you said she is my girlfriend the girl who is my girlfriend, the former is just a simple sentence, the latter is just a part of the sentence structure, you can also add words, such as the girl who is my girlfriend likes me, this is the benefit of the definite clause, you can turn 2 simple sentences into a compound sentence.

By the way, I have good grammar, trust me, I wish you good English.

A definite is a modification of a noun. For example, "beautiful girl", "pretty" is the final word. In English, if the definite is to be represented by more than two or more words, it must be placed after the modified word, which is different from Chinese.

For example, a girl on the right means "girl on the right". If you need a longer sentence to make a definite clause, use a definite clause, such as"my sister is the girl who is standing on the right".At this point, "who is standing on the right" is a sentence with a "girl" modifier to indicate that my sister is the girl who is "standing on the right".

That is, the definite clause.

the new school which has just been completed is very big.(1)

the new school ,which has just been completed, is very big.(2)

The new school, which has just been built, is very large.

Analysis: In sentence 2, if you put which has just been completed, is very bigRemove, then it does not affect the sentence.

But if you give sentence 1 like this, the whole sentence will be incomprehensible.

First, the form is different.

1. Restrictive definite clause: There is no comma in the restrictive clause, and there is no pause in oral expression.

2. Non-restrictive definite clauses: non-restrictive clauses have commas, and there are pauses in oral expressions.

Second, the functions are different.

1. Restrictive definite clauses: Restrictive definite clauses play the role of modifying, restricting, and identifying antecedent words.

2. Non-restrictive definite clauses: Non-restrictive definite clauses play a supplementary and explanatory role for the antecedents.

3. Translations are different.

1. Restrictive definite clause: When translating a definite clause, the general restrictive definite clause is translated before the antecedent word it modifies.

2. Non-restrictive definite clauses: When translating definite clauses, non-restrictive definite clauses are separated from the main clause.

The structure of the definite clause is: definite clause = antecedent word + relative word + clause.

A definite clause, a sentence is modified and qualified after a word or pronoun (antecedent), which is called a definite clause. Generally speaking, a clause is a definite clause in the whole sentence, and this clause is called a definite clause. A clause acts as a definite component in the main clause.

The modified word is called the antecedent. A definite clause is different from a case where a word is used as a definite clause in that it can usually only be placed after the modified word (i.e., the antecedent).

The definite clause is guided by the relative words (relative pronouns, relative adverbs), and the relative pronouns and relative adverbs are located at the beginning of the definite clause.

The difference between a restrictive clause and a non-restrictive clause.

1) From a structural point of view, a restrictive clause cannot be separated from a precedent by a comma; Non-restrictive clauses must be separated by commas. The relative pronouns that lead to non-restrictive clauses cannot be omitted.

For example: the clock, which my great-grandfather bought, is still in good order

This clock was bought by my great-grandfather, and it is still on track.

2) Two adjective clauses often give different meanings to the same antecedent.

For example: My sister who lives in London is a doctor

My sister, who lives in London, is a doctor.

my sister,who lives in london,is a doctor.

My sister is a doctor and she lives in London.

3) Non-restrictive clauses can treat the entire main clause as antecedents, while restrictive clauses do not have this function. When a non-restrictive clause modifies the entire main clause, it can only be guided by which or as.

For example: I said nothing, which made him still more angry

I didn't say a word, which made him even angrier.

he was a frenchman,as i could tell from his accent.

He was French, and I could tell from his accent.

he was drunk,which seemed to make a bad impression on the policeman.

He was drunk, which seemed to make a bad impression on the police.