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What do you think has happened to Tom What do you think Tom has happened Do you think what has happened to Tom Do you think what Tom has happened
us difficult us to be difficult difficult for it difficult for us
if Tom doesn’t have if Tom has unless Tom doesn’t have unless Tom hasn’t
But he was here just now.A. where Tom was where Tom has gone where can I find Tom where has Tom been
many; much much; many fewer; less more; less
Tom has lost his bike four days ago Tom has lost his bike for four days Tom lost his bike for four days It’s four days since Tom lost his bike
Tom Kate Tom and Kate Tom's sister
very undeniable less unchangeable
has died died has been dead is died
very undeniable less unchangeable