ANSWER: Of course you must sit with the imam and follow him in every step and when he concludes his prayer by giving salam on both sides, you must get up and pray your remaining rakahs.

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ANSWER: This is only before sleeping adkhar or when you do ruqya. It is totally prohibited to do it after prayers. 

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ANSWER: Those prayers are time bound and they are gone now. Skipping them for illness, Allah will reward you for them as if you had prayed them.

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