Addition

furthermore
moreover
too
also
in the second place
again
in addition
even more
next
further
last, lastly
finally
besides
and, or, nor
first
second, secondly, etc.

Time

while
simultaneously
always
so far
when
this time
soon
subsequently
whenever
meanwhile
sometimes
in the meantime
during
afterwards
now, until now
following

Place

here
there
nearby
beyond
wherever
opposite to
adjacent to
neighboring on
above, below

Exemplification or Illustration

to illustrate
to demonstrate
specifically
for instance
as an illustration e.g., (for example)
for example

Comparison

in the same way
by the same token
similarly
in like manner
likewise
in similar fashion

Contrast

yet
and yet
nevertheless
nonetheless
after all
but
however
though
otherwise
in contrast
notwithstanding
on the other hand
at the same time

Clarification

that is to say
in other words
to explain
i.e., (that is)
to clarify
to rephrase it
to put it another way

Cause

because
since
on account of
for that reason

Effect

therefore
consequently
accordingly
thus
hence
as a result

Purpose

in order that
so that
to that end, to this end
for this purpose

Qualification

almost
nearly
probably
never
always
frequently
perhaps
maybe
although

Intensification

indeed
to repeat
by all means
of course
certainly
without doubt
yes, no
undoubtedly
in fact
surely
in fact

Concession

to be sure
granted
of course
it is true

Summary

to summarize
in sum
in brief
to sum up
in short
in summary

Conclusion

in conclusion
to conclude
finally

Demonstratives acting as transitions

this
those
these
that

Pronouns serving as links to clearly refer to a specific word or phrase

his
our
its
they
theirs
her
it
your
their