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Kate forgot to send the letter yesterday.
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Потом 2 спец

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Общий: Did Kate forget to send the letter yesterday?Спец: When did Kate forget to send the letter?What did Kate forget to do yesterday?Альтерн: Did Kate forget or remeber to send the letter yesterday?Did Kate forget to send the letter yesterday or the day before yesterday?Разд: Kate forgot to send the letter yesterday, didn`t she?Kate didn`t forget to send the letter yesterday, did she?(К подлежащему: Who forgot to send thу letter yesterday?-She did.