Q. There is a person who is not able to daven on his own because he r"l had a stroke and it takes him very long to say the words. Therefore, the eitza that is done is someone stands next to him by Shmone Ezreh and davens in a way that is audible to him (e.g., by Maariv or by Mincha when there is no chazaras hashatz in yeshiva). Is this permitted - as one cannot raise his voice during Shmone Ezreh? Is the person yotzi like this, or is there something else he should do?
A. Horav Shlomo Miller's Shlit'a opinion is that during Shacharis and Mincha he should listen to the repetition of the shaliach Tzibur and have in mind to comply.
During Maariv he should recite Tefilas Habinenu (See Shulchan Aruch O.H. 110: 1). If that is also difficult, he can recite just the Tefila Ketzara (Broschos 29b, Gesher Hachaim 1: 3).
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit'a