Please check my sentences

[hirashin]

Hello, native English speakers.
Would someone please check my sentences?

(1) There are many people who can't/couldn't live without their cellphones.

(2) I have a friend whose father runs a nice restaurant in this town.

Hirashin

 

[lincstreff]

Both sentences are perfectly fine.

In the first, both "can't" and "couldn't" are fine. Also, "cellphone(s)" or "cell phone(s)" (i.e., one word or two words) are both fine. The two-word variation is more common.

 

[hirashin]

Thanks for the help, lincstreff.