You’ve lent a friend of yours one of the reference books in your own personal library, which you often use for your own research. Although he promised you to return it soon, he hasn’t done so, and you need the book urgently. You are upset and say to him:
A) Should you need other books for reference, you just let me know, and you needn’t worry about returning the book soon, which I have already lent you.
B) I hope the book I gave you has been most useful for your research; you can give it back to me when you don’t need it any longer.
C) Since you haven’t kept your word about the book you borrowed from me, I am really angry; it is an indispensable source for my research, and I need it now.
D) Since my library has a number of reference books, you can borrow them whenever you need them, and you needn’t hurry to return the one I’ve lent you.
E) You said you would return the reference book I lent you. It is alright; I am using other sources for my research.