Could you check my sentences. Thank you very much
1. You are supposed to unplug the light before you change the bulb. You could get a shock.
2. Everyone in the house is supposed to deal with their own mess. I'm not going to do all the cleaning.
3. We were all going to do some repairs on the house this weekend. Did you forget?
4. The landlord was supposed to have all of this done before we moved in, but he didn't.
5. I think the kitchen is going to be a good place to start.
All look good except for 2.
In 2, "Everyone" is singular, yet the pronoun later in the sentence that refers to it is "their" which is plural.
You can either change "their" into a singular, or you can change "Everyone" into a plural. Either way, you'll need to tweak the sentence so everything else matches, too -- including verbs.