Doubts which may be ignored

1176. The following doubts should be ignored:

Doubt about an act whose time of performance has already passed, like, during Ruku’ a person doubts as to whether he did or did not recite Surah Al – Hamd.
Doubt occurring after the Salam of prayers.
Doubt after the time of prayers has already passed.
Doubt of a person, who doubts too much.
Doubt by the Imam (one who leads the congregation prayers) and Ma’mum (follower), which will be elaborated later.

Doubt which occurs in Mustahab prayers.