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did your father retire has your father retired your father retired your father has retired
has been to has gone to has been in has left for
has studied; has communicated had studied; communicated studied; had communicated studied; communicated
Has been to has gone to Has gone has been
mustn't; has gone mustn't; has been
can't; has gone can't; has been
has went has been went has gone
stayed had stayed has stayed was staying
had stayed stayed has stayed is staying
has gone to has been to has been in went to
studied has studied had studied has been
has been, has left has gone, has gone has gone, has been away has been, has gone
has been, is has been, will be has gone, is has gone, will be
has been in has been to has gone to has come in
mustn't; has gone mustn't; has been can't; has gone can't; has been
has gone, has been has been, has gone has been, has been has gone, has gone
mustn't; has gone mustn't; has been can't; has gone can't; has been
protect prevent guard defend
studied has studied had studied has been
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