If nothing else, it means they are polite, which is refreshing in itself. Simple politeness seems to be becoming a rarity in today's society. I like your classmate's style.
Really...thank you(:
bad
Thank you for your effort and we 're really appreciated
A Classmate is someone you have to work with at school and you might become friends.
Your house is a metaphor representing your life. Having a classmate in your house in this dream merely illustrates this person "in" your life. It does not predict anything in the future. Any further meaning depends on how you felt about having this person in your house.
someone can be mean by really anything
It does not really mean anything. Its a type of snake.
doesn't really mean anything
Please resubmit your question as it is not quite clear what you are asking. Thank you.
I think he is just saying thank you. Maybe he really appreciated your help and just really wanted to express his gratitude to you.
同学Classmate or schoolmate
It means they're just saying thank you for the sake of it. They are really trying to say "i dont appriciate it!"