This is recommended if someone is reading for himself. But if one is praying behind an Imam, if the Imam pauses to ask Allah, you can do so. Otherwise, you should listen.

Sir, During Fard Prayer when the Imam recites about Paradise and Allah’s Greatness can we say Alhamdulillah? During the recitation when Hell is mentioned in Fard Prayer can we ask for Forgiveness?

Prayer | September 8, 2015 2:36 am
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If a person prays in congregation and the imam prayed 5 rakat instead of 4, do we people behind also pray 5 or 4? Because if we do 4, when do we do taslim, after once imam is done?
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What does one do when he sees an imaam and another person side to side together how does one let them know you want to join them? is there any ettiquette of doing a gesture?