Read the extract and answer the uestion
Ariel: All hail, great master! Grave sir, hali ! I come
To answer the best pleasure; be't to fly,
To swim, to dive into the fire, to ride
On the curled clouds, to thy strong bidding task
Ariel and all his quality.
(Act I Scene Two, lines 189 - 193)
Ariel has 'come' because