So I have this task I'm planning to give to my students. It reads "What do you say to your friend in these situations? Use the words given in brackets. Use present continuous (I am doing), going to or will. My problem is the #3 (attachment below).
It is specifically stated that "you haven't arranged" to hire a car yet, so my understanding is that it is a spontaneous decision you've just made and therefore the answer should be "we will hire a car". And yet, the keys say that the correct answer is "we're going to hire a car".
But how can this be true if "going to" is reserved for arrangements, which has not been made in this case? If I am wrong and the answer is in fact "we're going to hire a car", then what would the answer be if it was arranged to hire a car at the moment of speaking?