Travelling is a reason which permits the four-Rak`ah prayers to be shortened to two Rak`ah. The traveller may pray Witr after praying `Isha with Maghrib and praying them at the time of Maghrib.

1- It is permissible to combine Dhuhr and `Asr prayers, and Maghrib and `Isha’, for one who is travelling. It is also permissible for any traveller to combine prayers whether he has made a stop or is on the road. 2- It is permissible to pray `Asr in the train whilst sitting according to the majority of scholars if you cannot pray standing.

1- It is permissible for the person who is not travelling to combine two prayers if it will be too difficult for him to perform the second prayer on time. 2- It is permissible for you to bring `Asr forward and pray it with Zuhr in your home city if you think it most likely that you will not be able to pray it on time because of travelling.

If a person offers an obligatory prayer sitting when he is able to stand, his prayer is invalid. Whoever is not able to stand, bow, and prostrate because of sickness or old age, it is Sunnah for him to sit on the ground or on a chair. If the worshipper is going to pray on the chair from the beginning of the prayer until the end, then he should make the place where he will sit level with the row. If he is going to pray standing, but he will sit on the chair when he bows and prostrates, then what matters here is the standing position, so he should be level with the row when standing.

The traveller may offer whatever Sunnah prayers he wants. It is not Sunnah to omit any supererogatory prayers apart from the regular Sunnah prayers before and after Dhuhr and Sunnah prayers of Maghrib and `Isha.

If a pregnant woman is able to pray standing up then she has to stand. Then if she becomes unable to stand or it is too difficult for her to stand, then she can sit down while praying.