Yi-chun,

You may add more details to your answer.

I could live without cellphones.

I seldom use cellphones to communicate with my family and friends.

I talk to them face to face most of the time.

Sometimes, I contact them through e-mail when it's not urgent.

I could call them through a land line or pay phone if I need to speak to them in emergency.

I can always manage to find one.

Therefore, I could live without cellphones.

Ying-chu,

You may consider what I suugest.

Of course not!

Cellphones to me is like what food to human body.

Human cannot survive without food whereas i can't live without cellphones.

I rely my cellphone to ....

Without cellphone, my life would become chaotic or in a total mess.

Cellphones are a necessity of my life.

Xu-chen,

You may take my suggestion into consideration.

Of course not.

I would have a hard time living without cellphones.

If I don't have cellphones, how can I connect with my friends and family immediately?

Without cellphones, I will have to find a pay phone to call when there is an emergency.

That would be such a hassle.

Cellphone is a must for me.

Fang-yi,

You may considr adding some scenerios when you live without cellphone to make your statement longer.

Your response could be changed into something below.

I can't live without cellphones.

I use my cellphone quite a bit and carry it with me everywhere I go.

If I don't have my cellphone with me, I would ...

...

Life would be so inconvenient without cellphones.

Yi-Xin,

 Good job done in general.

However, you should modify some fragments of your answer.

...play games when I feel bored...

...I do many things through my cellphone...

Lily,

Please consider the following suggestions.

1. Cellphones are extremely convenient and important in our daily lives.

2.Besides, I have many cellphone numbers of my friends stored in my cellphone.

  Withour the cellphone, I won't be able to access my freinds' phone numbers to contact them.

Wen-chi,

Please consider the following answers.

I couldn't live with cellphones.

Without my cellphone, I wouldn't be able to contact anyone because I store my friends' phone numbers in my cellphone.

Without cellphones, I would have to find a payphone and bring some coins with me to be able to make a call.Payphones are not so common these days. Sometimes, it might take a long time to find one.

With cellphones, a phone call could be made within seconds.

Whereas, without cellphones, it might take more than ten minutes to make a call when you walk on the streets.

I couldn't live without cellphones now as it would be so inconvenient to make a call without using a cellphone.