Or vs IF and THINKING and HOD vs SUPPORT

4 question need help with ? please

1 Don't tell me its the same thing if you're home or not/as of you're not. When you are home, I've got more work to do. (how would you say this please?)
2 I never asked for that. I never said you could stay at my place tonight. (can you say ASK FOR SOMETHING in this context?)
3 Think about what he's thinking. Try and put yourself in his place. (can you say the first part?)
4 the bed can't hold/support 300 pounds. (which would you say?)

thanks