а) предложения, в которых ing-форма является подлежащим
The driving wheel of the machine is broken.
These happenings are remarkable.
Travelling is a pleasant way of improving one’s education.
Asking him for help is useless.
в) предложения, в которых ing-форма является обстоятельством
Every trust arranges for the marketing of its products.
It is no use crying over spilt milk.
We have every chance of passing our examinations well.
You don’t know what you miss, not having the desire to listen to good music.
с) предложения, в которых ing-форма является частью сказуемого.
Happily we escaped being delayed on our way.
Having been knocked down by a passing car, the poor man was at once taken to hospital.
I was told of a great friendship existing between two captains.
Driving in a motor car, we passed many villages.
Объяснение:
My favourite animal is a dolphin, because i like these clever animals. Did you kniw that dolpins can speak with each other with the help of their wonderful language of sounds? So, they can, and they also have a great "lexicon", because they are cleverer than dogs or some monkeys. Dolphins are also very graceful and it is a real pleasant to watch them swiming in the water. I like to go to the dolphinarium and watch them doing their marvellous tricks. If it was possible, i would have a dolphin as a pet, i like them so much!
