Last but not least, I would like to see this girl for thank her for helping me and enjoy of her conversation again. It is fine except for the ending "and enjoy HER CONVERSATION AGAIN" without the word OF.

Last but not least, I would like to see this girl to thank her for helping me and to enjoy her conversations again. Mostly fine but some words do not fit. eg "I would like to see this girl for thank her" should be changed to " I would like to see this girl to thank her" and another mistake was "and enjoy of her conversation again." was changed to "and to enjoy her conversations again." Hope this helps!

This is how I would write it: "Last but not least, I would like to see this girl TO thank her for helping me and to enjoy another conversation with her". It doesn't sound very natural to say "her conversations" as she doesn't own the conversations. At most, you could say "our conversation" but I think my correction is more natural.

1. Although the word "to" (as suggested by other commentators) is both short and to the point, one might instead use a variation like "so that I could" or (more colloquial) "so I could". Personally, I think either of these two alternatives sound more natural (i.e. less "robotic"), compared to "to". 2. In terms of the ending, I think, stylistically speaking, you should make it into another sentence. And I also think it is wise to NOT use the word "conversation" or "conversations" or anything like that (you are not addressing a linguist, I suppose). I would use the simple word "speak" in an active style. MY SUGGESTION: "Last but not least, I would like to see this girl so (that) I could thank her for helping me. It will be great to speak with her again!" Best wishes! Bosse

thanks!