02br 00b) 00They sat on the beach 01b 00until02b 00 the sun sank below horizon and then they went home. 02br 02br 00To me in both sentences the action continues up to a 00particular time00 ( 00the parcel arrived00,00 00and the waiting stops; 00the sun sank00 and they stopped sitting on the beach)02br 02br 00Why can we use 01b 00before02b 00 and 01b 00until02b 00 in the sentence a) and only 01b 00until02b 00 in the sentence b)02br 02br 00This is an interesting question. My first reaction is simply to say that the conjunction 'before' means 'earlier than the time when'.
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