A person who is on life support on a respiratory, can they sit up and converse/talk with others? from what i read, life support is similar to being in a coma, half alive and half not. what are the conditions of the person who is put on life support, who

A : A person on a ventilator (a machine that pushes air into his or her lungs) is usually very ill and would not be able to communicate very well, much less sit up in bed. However, that's not always the case. It is certainly possible for a person to be awake, alert, and aware, and yet not have the strength required to breath independently. In such cases, the person could definitely communicate (by writing notes).