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Phul maya said:
I'm from Nepal sir how can I apply please let me know I'm interesting .....

without any information about you, it's difficult for people to "help". please give a little context.

1. assume you are not a Canadian Permanent Resident, you need to check the immigration section to become a resident first.
2. assume you are a Canadian Permanent Resident, refer to cic.gc.ca and you can find all you need to apply to become a citizen.