You may use a first name if you are asked to (call me …).
如果你得到允许的话,你便可以直呼某人的名字。
I only wear a tie on special occasions.
我只有在特殊场合才带。
Why does the idea of progress loom so large in the modern world? Surely progress of a particular kind is actually taking place around us and is becoming more and more manifest.