简答题：下面是某教师的课堂教学片段：T: ... Now, let's make our own wishes with"if

下面是某教师的课堂教学片段：
T: ... Now, let's make our own wishes with"if only". But please don't forget to give a description, even though it's very brief, of situation, the context, where you make the wish with one or two sentences ... How about Liz?
Liz: Now it's 5 o'clock, and there is a traffic jam on the express way. The hotel will cancel our room at 6 o'clock if we do not get to the hotel. Then, I'll say:Oh, I wish if only I didn't go on the journey.
T: Listen, Liz. You see, once you use"I wish", you don't need to use"if only". Just use either one.
Liz: Yes.
T: So will you try again? Just the wish.
Liz: If only I didn't go on the journey.
T: To make it better, you can say"if only I hadn't gone on this journey", because you are already on the way. Go on, please.
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