What
What does it cost to fly from London to Paris?
Do you know what it costs to fly from London to Paris?
I (don't) know what it costs to fly from London to Paris.
When was this building built?
Do you know when this building was built?
I (don't) know when this building was built.
How far is it from Vancouver, Canada to Riyadh, Saudi Arabia?
Do you know how far it is from Vancouver, Canada to Riyadh, Saudi Arabia?
I (don't) know how far it is from Vancouver, Canada to Riyadh, Saudi Arabia.
Is Australia the smallest continent?
Do you know if/whether Australia is the smallest continent?
I (don't) know if/whether Australia is the smallest continent.
Does a chimpanzee have a good memory?
Do you know if/whether a chimpanzee has a good memory?
I (don't) know if/whether a chimpanzee has a good memory.
What is one of the longest words in English?
Do you know what one of the longest words in English is?
I (don't) know what one of the longest words in English is.
When did the game start?
Do you know when the game started?
I (don't) know when the game started.
How many eyes does a bat have?
Do you know how many eyes a bat has?
I (don't) know how many eyes a bat has.
Are glaciers big icebergs?
Do you know if/whether glaciers are big icebergs?
I (don't) know if/whether glaciers are big icebergs.
Do we have to use the vocabulary?
Do you know if/whether we have to use the vocabulary?
I (don't) know if/whether we have to use the vocabulary.