"Seeing you are happy, " or "seeing you were sad".
you can use "had", seeing does not decide the tense. You can say
所有跟帖:
• 好的,謝謝 Flyingstraw!原帖又加了一個問題:) -虔謙- ♀ (0 bytes) () 10/23/2016 postreply 16:33:54
• you can use: -Flyingstraw- ♀ (137 bytes) () 10/23/2016 postreply 16:46:12
• Okay, got it. Thank you again! -虔謙- ♀ (0 bytes) () 10/23/2016 postreply 16:55:39