Look at the family tree again.who is/are: 1 twins? 2 bill`s parents? 3 bill`s grandparents? 4 mike`s son? 5 sam`s wife? 6 janet`s husband? 7 sue`s daughters? 8 in their late sixties? 9 in his mid forties? и скажите,как узнать,где ставить are,а где ставить is и пример и скажите правило.

1.   twins? — Kim and Kate

2.   Bill's parents? — Sue and Sam

3.   Bill's grandparents? — Tom and Beth

4.   Mike's son? — Johnny

5.   Sam's wife? — Sue

6.   Janet's husband? — Mike

7.   Sue's daughters? — Kim and Kate

8.   in their late thirties? — Mike

9.   in his mid forties? — Sam

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1) единственное число или неисчисляемое существительное - is. 

2) множественное число - are. 

3) I - am, 

    he/she/it - is, 

    you, we - are. 

There is a chair near my bed.

There are two chairs near my bed.

3. He is my best friend Nick.

4. You are my best friend.