OHH............I see now. The new example helped a lot. In the first example, she'll probably enjoy herself, right? However, on the other example, there is a possibility that she might not.
Thank you so much!
However, I've got one last final question. What's the difference between saying, "I just finished reading a book" (for example) and "I've just finished reading a book?" What's the difference between both? (I've heard both... that's why I'm asking). Thanks in advance.