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before; since since; when since; before when; before
at times in time all the time from time to time
before; before since; since before; since since; before
at times in time all the time from time to time
since the last century for a very long time since a few hundred years ago since a few years ago
Since the beginning have become in the way how
before; since when; when since; before when; then
has been living lived iS living lives
increased to risen by increased by risen to
before；since since；when since；before when；before
In the end At the end of In the beginning At the beginning of
before; since when; when since; before when; then
before, since since, before when, when since, when
since; before when; when since; when before; since
before; since since; when when; before since; before
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