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1 Parents often join their children for picnic games.
Do parents often join their children for picnic games?
What do parents often join their children for?
Whom do parents often join for picnic games?

2 George prefers a barbeque picnic to sightseeing.
Does George prefer a barbeque picnic to sightseeing?
What does George prefer?
Why does George prefer a barbeque picnic to sightseeing?

3 A cool box is used to keep products fresh.
Is a cool box used to keep products fresh?
When is a cool box used to keep products fresh?
What is a cool box used for?

4 Last time I went on a picnic when I was ten.
Did I last time go on a picnic when I was ten?
When did I last time go on a picnic?
Where did I last time go on a picnic?