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Is there any work visa im from Pakistan
Not sure what you mean. Do you have a Canadian job offer with approved LMIA proving no Canadian/PR has your work experience, education and language skills? If not you cannot apply for a work visa.
 
I want to come to Canada, I don't have enough money to get a visa
You are not eligible for a visa until have a job offer with approved LMIA. Don’t fall for scams that promise free food, accommodations, airfare, transportation. Nothing is free. You need money to get a visa.