An user English
says…

How'd
  you
Pronoun
  happen
Verb
  to
Particle
  fall in
?

How'd you happen to fall in?
Words and sentences
New
how'd

  1. how did
  2. how had
  3. how would

New
you

New
happen

New
to

New
fall in

  1. To collapse inwards.
  2. Of a soldier, to get into position in a rank.
  3. To come to an end; to terminate; to lapse.
  4. To become operative.

New
fall

New
in

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