What ______________________ (Helen, do) for the last two hours ? - She ______________________ (prepare) for next week’s meeting; she ______________________ (dust) the furniture now.
What HAS HELEN BEEN DOING (Helen, do) for the last two hours ? - She HAS BEEN PREPARING (prepare) for next week’s meeting; she IS DUSTING (dust) the furniture n
His sister ______________________ (be) in Australia six times and I ______________________ (be) there only twice.
His sister HAS BEEN (be) in Australia six times and I HAVE BEEN (be) there only twice.
We must wake her . She ______________________ (sleep) for 15 hours
has been sleeping
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