sed pattern recognition with consecutive lines

I have been playing with this all morning and have not found the
solution so hopefully someone has a suggestion.  What I am trying to
do is have sed recognize a pattern of words falling on consecutive
lines, for example if I had an example file structured as:

I
have
been
there
and
I
do
not
like
it

and I would like to make the file look like this:

I
have
been
there
and
We
can
like
it

My thought was something like:

sed 's/I\ndo\nnot/We\ncan/' example.file

but this does not work.  I can make the newline (\n) work in the
replacement part, but it does not seem to work in the pattern
recognition part.

Any ideas?






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