I'm going into the Canada through family sponsorship to live with my boyfriend for a year so we can apply under common law. The last time i went to Canada for a visit and stayed there for 3 months, the customs officer asked me "how do I know that you will be returning to the US?" and I had to show him my returning flight. My question is what am I suppose to say to the immigration officer when I go through customs, do I explain that ill be there for family sponsorship and id apply to extend my stay at 6 months? They also make me fill out a card to write how many days id be staying in Canada as well, do i leave that blank and explain it the to officer when i speak to him? i'm not sure how to go about this.