In loud Rakah, you may recite only the Fatiha but it is not mandatory. In silent Rakah, you must recite the Fatiha and if there is time, you can recite something else from the Quran.

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If there are strange men around who could see you and you have no other place to pray, you must keep it on.

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If you missed it deliberately then you cannot pray, and if you missed it due to legitimate reason then you have to make it up as soon as you remember and do not delay it.

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