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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