which one is correct??

please think before you print 才正確
請列印前想一想

please think before your printing
這句的意思是 : 請想一想在你的印刷品之前
please think before your print
這句的意思是 : 請想一想在你的印刷之前

please think before your print
hope it can help u:)

please think before your printing is correct. 001 and 002 is wrong

please think before your print

應該是:

Please think before you print.

2013-03-13 04:21:10 補充：
print 和 printing 可做名詞
Print = 圖片, 照片; 印刷品; 出版物
Printing = 印出的字(或圖片); 印刷品; 印刷字體
Before (prep.) = 在...面前
Your (possessive pronoun) = 你的

如果是這個意思:

請想一想, 在你未列印之前 = Please think before you print.
print 是 verb

"print" is the abstract noun.
please think before your print=the print of what you think in your impression.
please think before your printing=I like to think clear before printing.(participle.)

please think before your printing is correct.
因為your後面要用名詞，printing是名詞，print不是。希望我可以help you!001&002是錯誤的事例，請不要學習!!!

please think before your print is ture.
Ihope i can help you ^_^

please think before your print = correct