There is a concession allowing Maghrib and `Isha’ prayers to be joined at the time of Maghrib when there is rain that soaks people’s clothes and will cause hardship when going to the mosque for `Isha’ prayer.

Prophet Muhammad preferred for women to pray in their houses and said that their reward for doing so is greater than their reward for praying in the mosque. If women need to pray in the marketplace and there is a place that is screened off, there is nothing wrong with them praying there. A woman’s prayer is not invalidated just because a man happens to see her.

Anticipating or preceding the Imam in prayer is forbidden, and if it is done deliberately, it invalidates the prayer. Delaying following him, like preceding him, is not allowed.

The sick person is excused from Jumu`ah prayer and from praying in congregation. What is meant by that is the kind of sickness which means that it is too difficult for the person to go and pray in the mosque.

The one who most deserves to lead the prayer is the one who has the most knowledge of the rulings on prayer and has memorized the most Quran.

If the woman is one of your Mahrams, there is nothing wrong with you leading her in prayer and it will be counted as prayer in congregation. But if she is a non-Mahram, and if your leading her in prayer means that you will be alone with her, then in this case your leading her in prayer is prohibited.

1- When a person prays behind an imam, four scenarios may apply: 1- doing a movement before the imam, 2- delaying in following the imam, 3- doing an action simultaneously with the imam, and 4- doing a movement immediately after the imam. 2- Following the imam is the Sunnah and what it means is that a person starts to do the actions of prayer immediately after the imam starts them, but without doing them at the same time.