blacknomi said:

The difference between restrictive and non-restrictive is whether you put a comma before relative pronoun or not. In addition, comma is not allowed before relative pronoun 'that'.

#1

There were maps hanging on the wall**s** of the classroom, which means the wall on your left, the wall on yor right, the wall behind or in front of you has maps on it. And the teacher just pointed the rear wall rather than other walls around you.

#2

Where were the maps?

You can only see maps on the rear wall. That's it. You can't see maps on your left, on your right, behind or in front of you.

**Examples**

1. __My students that works at the restaurant are nice.__

==> I have many students. They have different occupations. But here I am talking about those who work at the restaurant.

2. __My students, who works at the restaurant, are nice.__

==> All of my students work at the restaurant. All of them are nice.

Hope that helps.

Very good teacher! Let me make a couple of corrections.

The difference between restrictive and non-restrictive is whether you put a comma before

the relative pronoun or not. In addition,

a comma is not allowed before

the relative pronoun 'that'.

#1

There were maps hanging on

all the wall

**s** of the classroom, which means the wall on your left, the wall on your right, the wall behind or in front of you has maps on it. And the teacher just pointed

to the rear wall.

#2

Where were the maps?

You can only see maps on the rear wall. That's it. You can't see maps on your left, on your right, behind or in front of you.

**Examples**
1.

__My students that work at the restaurant are nice.__
==> I have many students. They have different occupations. But here I am talking about those who work at the restaurant.

2.

__My students, who work at the restaurant, are nice.__
==> All of my students work at the restaurant. All of them are nice.