IRCC will return your application as incomplete if you do not send acceptable proof that you have adequate knowledge of English or French. You can learn more about the language requirements for citizenship on the IRCC website.
You can use the Residence Calculator to find out if you have been in Canada long enough as a PR to apply for citizenship. If you have not been in Canada long enough, it will tell you when you will be eligible to apply.
The applicant must be a Canadian citizen or be applying to become a Canadian citizen. Minors do not need to meet the residency requirement.
You cannot become a Canadian citizen if you have recently been or are in prison, on parole or probation, are serving a conditional sentence, or have been charged or convicted of an indictable crime. If you are under a deportation order, you also cannot apply.