restrictive attributive clauses, which cannot be left out.

T: How can you distinguish restrictive and non-restrictive attributive clauses?

S4: We don't use commas with the restrictive attributive clauses while we use commas with the non-restrictive attributive clauses.

T: Yes, you are right. Then, for example, in sentence 6, can we use "that" instead of "which"?

S5: No, we cannot. We never use "that" in the non-restrictive attributive clause as relative pronoun.

T: Thank you, you said it right. Can the relative words be left out in Group A?

Ss: No, they cannot.

Give a summary of the restrictive and non-restrictive attributive clauses, especially non-restrictive attributive clauses.

T: The Non-restrictive Attributive Clause is a clause that gives extra information to the antecedent. So we use a comma to interrupt the sentence. When the Non-restrictive Attributive Clause is cut off, the sentence still has a full meaning. Now look at the sentences on the screen.

Show the following on the screen.

1. I have two brothers, who are both soldiers.

2. Next week, which you'll spend in your hometown, is coming.

3. I've tried two pairs of shoes, neither of which fits me well.

T: There are commas to interrupt the sentences and "that"can not be used in the Non-restrictive Attributive Clauses. You should pay more attention to the structure "Indefinite Pronoun/Numbers/Noun/Superlative+of which/whom" is often used in the Non-restrictive Attributive Clauses.

Also, we should pay attention to the he Usage of the Relative Pronouns and the Relative Adverbs.

As we know, relative pronouns or adverbs play important parts in the Attributive Clause. Now let's make a list of them on the blackboard first and then revise their usage with the help of the forms on the screen.

Bb: the relative pronouns: who, whom, that, whose, which;