Here is a set of words that can be used to create cards and power points, to teach sentence structure. These words are all connectives useful in joining and extending sentences together, making normal sentences into more complex sentences.
finally
firstly
furthermore
in the end
In the meantime
initially
at first
because
before
but
consequently
due to
after a while
after that
also
although
as
as a result
then
until
when
whenever
later on
meanwhile
next
since
so
suddenly