8. when/your sister/come back/from her holiday? 9. water/cover/80 per cent/of the earth's surface?
10. how many people/speak/English/as a first language?
11. what language/those/people/speak?

When will your sister come back from her holidays ?

Water is covering 80% of the earth's surface

How many people does speak in English as a first language

What language does those people speaking?

Объяснение:

8) when your sister come back from her holiday?

9) cover water 80 percent of the earth's surface?

10) how many people speak English as a first language?

11) What language those people speak?

а что тут надо делать? все по порядку вроде