Englishfor English speakers
in
Preposition
—
Used to show that something is inside something else.
The cat is in the box.
—
Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
—
Used to show movement towards the inside.
The rain came in through the window.
den
Noun
—
A den is a place where a wild animal lives.
The wolf went back to his den to sleep after a day of hunting.
—
A den is a small cave in the side of a hill.
Bart
—
noun
(= baronet)
a member of the British order of honor; ranks below a baron but above a knight
since he was a baronet he had to be addressed as Sir Henry Jones, Bart.