Как образуется вопрос к подлежащему? в каких случаях к глаголу добавляется опостраф s?

Вопрос к подлежащему образуется так Who(кто) или What(что) затем все преложение без подлежащего. Опостроф приписывается в past simple, когда подлежащие стоит в форме 3 лица(she,he,it)

1) is there a cat in the window? - yes, there is
2) are there a few changes in the text? - yes, there are
3) are there planry of glasses in the cupboeard? - yes, there are
4) were there a lot of people at the stadium? - yes, there were
5) is there anything on the plate? - no, there isn't
6) was there anybody in the room? - no, there wasnt
7) are there difficult exercises in this book? - yes, there are
8) is there somthing on the shelf? -yes, there is
9) Will there some interesting programmes on Tv tomorrow? -yes, there will
10) are there several vacant seats in the room? -yes, there are
11) were there any pears on the plate? -no, there werent

1). They say, "Health is above wealth". 2). Thousands of people consider sports to be very helpful in gaining good health. 3). That's why every country pays much attention to developing sports. 4). It is sport that helps to bring up physically strong, strong-willed, courageous and energetic people.
5). Unfortunately, it is very difficult to find time forgoing in for sports regularly. 6). People have become too busy nowadays. 7). There are quite a number of people who prefer watching sporting events rather than taking part in them. 8). They are so-called sportfans. 9). They pack stadiums during sport matches and competitions, they sit glued to the TV, and they are ready to give every moral support to their favourite sportsmen or teams.
10). In the meantime thousands of people devote their spare time to going in for sports. 11). They play indoor and outdoor games: volleyball, basketball, table-tennis, hockey, law-tennis. 12). The number of participants and spectators show that the most popular games are basketball, hockey and, of course, football. 13). A lot of people go in for track-and-field athletics, cycling, boxing, wrestling, gymnastics and so on.
14). Hockey, figure skating, skiing and skating are among the most popular winter sports. 15). In summer swimming is enjoyed by millions of people. 16). There are also many indoor swimming pools, which make swimming possible all the year round. 17). Cycling is useful exercise, too, because it takes you out into the fresh air and gives much work to all the muscles. 18). So if you arrange your day correctly you can find an opportunity for sports.