Can I recite ziyarat ashura in English and do I have to recite the Salam and lanat 100 times and do I have to do sujood for the last part or are they all recommend bits?

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Yes you are allowed to do all what you have asked. Its better to recite in Arabic ( at least transliteration) instead of translation. Also if you have time and courage better to recite Salam and Curse 100 times also better to recite ( Alla human lakal hamdu hamdash shakerina ala…) while you are in sajdah.