Дієслово to be це правильне дієслово? Чи неправильне? Або може бути і правильним та не правильним

Дієслово "to be" є неправильним дієслово

1.Can или could.

2.Мы используем данное время для описания простых регулярных действий,привычек,предпочтений. Слова подсказки:always,usually,sometimes,every day/week/year/month ,on Sunday/MondayПример-I work in a hotel.

3.Это время указывает на процесс,который длится в момент речи.Слова подсказки:now,right now,at the moment.Пример-Sally is doing her homework at the moment/

4.am/is/are +3 форма глагола,если он неправильный или глагол с окончанием ed,если он правильный.Например-theese book are used for work.

1.Were you watching the film when the phone rang?

2 John  saw  a bright light as he was walking  down the street.

3 The baby was not sleeping  when Grandpa arrived.

4 Were the children studying while their nanny was preparing  dinner?

5 While you were out, the postman came and delivered these letters.

6 What happened to you?  I had an accident while I was driving to work.  Did you go to the hospital? Yes, I did.

7 What did Claire do when you were phoned to her?

        She listened to music.Did she turned off the radio?No,she didn't.She                      wanted to listen to music programme.

8 I was reading a book last night when I heard my sister shouting what happend?

         She was doing the washing up when a plate broken and she cut her finger.