In Canada, you can apply for a maple leaf card without a marriage certificate, but certain conditions need to be met.

1. Regarding the status of international students applying for maple leaf card:

The applicant must be a Canadian graduate.

Applicants must complete a professional course in Canada or above within the last four years.

Applicants should provide a certificate of work in Canada, with no restrictions on such jobs and no minimum working years required.

The applicant's English score must reach CLB5, which is equivalent to 4 points for IELTS reading and 5 points for the other 3 items.

2. For ordinary people applying for a maple leaf card, one of the following conditions must be met:

During every five years, the total time of living in Canada actually reaches 730 days.

Accompany your spouse with Canadian nationality abroad, or your child with Canadian nationality abroad with parents.

Full-time Canadian businesses work abroad or hold formal responsibilities in Canadian provinces.

As a permanent Canadian resident, having permanent Canadian resident status abroad, working full-time in a Canadian business or performing formal duties in a Canadian province.

In short, not having a marriage certificate does not prevent you from applying for a maple leaf card in Canada, but the applicant must meet other relevant conditions. It should be noted that the specific procedures and materials required for applying for a maple leaf card may vary depending on personal circumstances and policy changes. It is recommended to consult a professional immigration consultant or attorney for the most accurate information.