1.this的复数的指示代词是什么?

1.this的复数的指示代词是these.
2.He likes to watch clouds(同义句)
He likes watching clouds.
3.Everyone will learn English.(同义句)
Everyone is going to learn English.
4.John will (say googbye) to his friends(对括号里的提问)
What will John do to his friends?
5.They are buying gifts(同义句)
They are buying presents.(此题费解)
6.Mary is singing now(同义句)
Mary is singing at the moment.
7.These books are mine.(一般疑问句)
Are these books yours?
8.He can buy some pens (in the shop)(对括号里的提问)Where can he buy any pens?
9.(Lily) wants to go shopping today(对括号里的提问) Who wants to go shopping today?
10.It's his favourite.(同义句)He likes it best.

these
what will Jhon do to his parents？
Are these books mine?
Where can he buy some pens?
Who wants to go shopping today?
同义句不知道啥意思

these
He likes watching clouds.
Everyone is going to learn English.
What will John do to his friends?
They are buying presents.
Mary is singing at present.
Are these books mine?
Where can he buy some pens?
Who wants to go shopping today?
He likes it best.