Although talent may be a crucial element on the road to fame, it is difficult to succeed without a highly developed work ethic.
I've tried looking this up in every grammar guide I can find, but I haven't found the answer. Consider these two sentences: I bought a car to drive myself to work. I bought an alarm clock to wake me in the morning.
Modality refers to a set of related concepts primarily involving the attitude of the speaker of a sentence towards the reality of a particular assertion. What exactly that means is complicated and best illustrated with an example:
(12a) Tad programs computers for a living.