一个在国内呼朋唤友的男人自己在加拿大生活三年,能有多大变化?

That depends on individual. I have seen some never change for 20 years: speak Chinese, eat Chinese food, wear fake LV bags, watch Chinese tv and vacation in China.

I have seen some staying here for 6 months and pretends she does not speak Chinese anymore.

There is a joke. If a new immigrant changes and adjusts to the Canadian society well, he or she will gain 10 lbs a year, ie 30 lbs in 3 years before getting citizenship. Why? He or she is so used to Canadian diet: fries, fast food, milk, cheese and etc.

Ask you friend if he has gained weight or goes to KTV. If he hasn't gained too much and keeps going to KTV, he remains same old, same old.

相貌应该变化不大，但世界观会变的

穿着土气, 说话洋气, 花钱小气

呵呵，照样呼朋唤友，只是换了另外一些人罢了，^_^

英文口语应该提高了！