Hi Hina,
In order to qualify as a permanent resident in the UK you must be able to show that you were given permission to enter or remain in the country on a marriage visa, as a husband, wife or civil partner of someone settled in the country and that the period of the visa for spouse immigration has been completed.
You will also need to provide a range of documentation, including passports and evidence of co-habitation as part of your permanent residence application.
If you want I can offer you a free consultation. Call me on 0208 478 3333. Regards, Don