about the grammar...

Is anybody sitting there? this sentence, when saying this to another person, does not really relate to anything 暫時性 or not, but rather asking for the fact that if someone takes the seat or not, if so, whether that person just go away for a while or he or she will not go back to take the seat anymore. Then, since that person may still come back to continue his or her act of taking the seat, so use simple present continuous tense.

for your second sentence, since "who" refers to a person. and "does" actually refers to "who". the whole sentence means "who owns the umbrella". Or else, you can change it to "Whose umbrella is this?"

if we say Do you like Beatles? its very likely to have yes or no answers only. "Yes, I like Beatles. Beacuse..." but if we say are you into beatles", we can say "We are not really into beatles because their music is too slow for me..." the difference is "Do you" has more definitely answer while "Are you into..." can give us more flexibility.

Let me help you...Listen !!!

Is anyone sitting here . This sentertens have is , so we use present continous tenses.



I hope I can help you!