我认识她大概12年了，我猜。

I've known her for about 12 years, ___I ___guess.

我猜我爱她，尽管我们彼此不太了解。

___I ___guess that I love her although we do not know each other very well.

我猜她不会来参加派对。

___I ___guess she's not coming to the party.