For the past tense and past participle of dream, dreamt and dreamed are both used and are both correct. Dreamed is pronounced/dreemd/ (and occasionally/dremt/) and dreamt is pronounced/dremt/. For the past tense in British English dreamt and dreamed are equally common, but in US English dreamed is more often used. For the past participle, dreamed is used more often in Britain and the US.
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