Everyday objects

Hi everyone, I am an English teacher, so if you need help feel free to contact me.

Hello Sir, I don't understand when we must to use THAT: For example two sentences bellow: - This is a bag that you put on your back. - This is a small suitcase we use to carry things for work. => Could we use THAT in the second one: This is a small suitcase THAT we use to carry things for work Thank you for your explain Ngoc

When I need to go out, I take my rucksack and put my mobile phone, house keys and wallet in it. I don't need a lot of stuff in my rucksack because I don't like to take too much with me.

It can depends for what reason I go out. If I just go out to walk or to go to the market for example, I just bring my mobile phone, keys and my wallet. If I go out to work, I carry in additional my briefcase which contains my laptop, my glasses and my papers work.

When am going out I carry the following: - Mobile phone. - Wallet. - Rucksack and - Keys.

When i go out i just carry purse, glasses and cellphone.

when I go out I do carry my rucksack, home keys, and purse.

I usually wear keys at home, the car keys, computer in the briefcase, my wallet everydays, purse too, my phone it is very important.

I don't carry many things; only rucksack, wallet and keys.