Чем отличается глагол be от других английских глаголов в Present Simple в утвердительной форме?

глагол (to) be, в отличие от других глаголов, изменяется по лицам и числам. в утвердительной форме Present Simple он имеет три формы - am, is, are.

I am

he/she/it is

we, you, they are

1. How long has she been feeling unwell?
2. I have never met such a nice person before.
3. I have been waiting for you since four o'clock.
4. She has never written a letter by hand since she bought a computer.
5. I wonder where you have been all this time.
6. I have been learning English for five years.
7. You never know how he is going to react.
8. She has tripped over the cat and fell nearly over.
9. Look! I found a ten-pound note! - Where did you find it?
10. Margaret is taking driving lessons now.
11. In recent years terrorism has become a greater threat.
12. The rain came suddenly and soaked all the washing.
13. Ever since we met, you have never asked me what I prefer to do.

How long has she been  feeling unwell?

2)I've never met such a nice person before

3)I've been waiting for you since four o'clock.

4)She's never written a letter by hand since she  bought a computer.

5)I wonder where  you have been all this time

6)I've been learning English for five years

7)You never know how he is going to react.

8)She has tripped over the cat and fell nearly over.

9)Look! I found a ten-pound note! - Where did you find it?

10)Margaret is taking driving lessons now.

11)In recent years terrorism is becoming a greater threat.

12)The rain came suddenly and  soaked all the washing.

13)Ever since we  met, you have never asked me what I prefer to do.