今日は仕事以外に用事がないから、ずっと家にいると思うなぁって英語でなんて言うの？

Not leaving the house is something people normally find to be a negative thing. As people enjoy going out to do things, but if you have a lot of work to do at home, or a family to take care of you can use phrases like these. Future/ Present tense. I'll be stuck at home/ I'm stuck at home. I'll be trapped at home/ I'm trapped at home. I won't be able to leave/ I can't leave my home.

"I'll be at home today with nothing but work to do." means that I will be at home working and not going anywhere else.

I don't have any plans for the day, I'm just going to stay home. - this simply expresses that you are free for the day, and have chosen to stay home. I'm going to stay home, as I don't have any plans. - this is just another way of of saying the first response. Both can be used interchangeably.

You can explain that you are working for the day and that you work from home so therefore you will be home all day. -I will be home all day working. -My only plans for the day is work and I work at home.

You may start with the reason why you will home all day. Also, if you are giving this reason to somebody while you are at home, you can end with 'I will be here all day'. Your reason for being home all day can start with the conjunction 'because', or the expression 'due to the fact that'. So, you may say: Because I work from home and have no plans to go anywhere, I will be here all day. or Due to the fact that I work from home and have no other plans away from home, I will be home all day. or I am absolutely certain that I will be home all day because I work from here and I have no plans to go anywhere.

In American English, "chill" is slang for the word "relax." It is very commonly used among people of all ages. I hope that this helps. :)