I've been struggling with these 3 setneces. PLease take a look

I've been struggling with these 3 sentences. Could someone take a look?

1 We don't get along as we don't have the same opinion of our family members. We don't think the same of our family members.

2 You only know what you've read of/on the drug. You haven't experienced it first hand.

3 She takes me for an idiot. (can you say TAKE SOMEONE FOR SOMRETHING?)

4 I sleep on the ground but since the matress is so thick, I'm elevated from/off the ground.

Thanks