1) Do you speak* (*by speak, we mean ability to comprehend and articulate) any dialect? If no, what language do you speak mainly and SKIP QUESTION 2)

yup, hokkien.

2) If yes, to whom? How do you rate your proficiency level?  (comprehension only, or plus articulation)

To my grandparents. Just basic level, able to comprehend and  articulate.

3) Do you find that Mandarin is replacing the role of dialects in places eg. home/market/hawker centre? If yes, has Mandarin "diluted" your dialect? (eg. do you replace the words you can't say in dialect with Mandarin instead?)

Yes. and another yes.

4) What is your opinion of people who speak dialects?

its ok for elderly, but will find very weird to see young adults to use them as 'everyday' language. find the latter as uncilivised and ah beng-ish.

5) Given a chance, would you join classes provided for the learning of your dialect?

no.

6) If you have children of your own in the future, would you want them to learn your own (or any) dialect? Why and why not?

yes, so as to preserve our traditional culture.