According to most kids,it is boring (playing) the violin all day.
all day：全天,使一段时间,所以用现在分词,做状语.
It was stupid of you not (to take) her advice
it 是真正的主语,to do sth 是真正的主语,
I feel it an honour (to be asked) to speak at the meeting.
it 是形式宾语,to speak at the meeting 是真正的宾语.