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grammer and tenses

grammer and tenses

hi there

i am struggling with a few questions,if someone can possibly assist me.

the answers have to relate to the tenses. the teacher said that the answers should not be predictable but rather an explanation using the tenses.

1) what's the difference between "I live in Paris" and "I'm living in Paris"

2) what is the difference between "The room is too big" and the room is very big"

3) why can't you say "I've been knowing him for 2 years"

4) why can't you say "I've been studying English since 5 years"

5) why do you say "on" Christmas day But you say "at" Christmas.

looking forward to your response.