An era can be bygone.Logical formLearned from2 787 sentences. Days can be bygone.Logical formLearned from1 182 sentences. An age can be bygone.Logical formLearned from577 sentences. Times can be bygone.Logical formLearned from285 sentences. Eras can be bygone.Logical formLearned from252 sentences. Years can be bygone.Logical formLearned from190 sentences. A time can be bygone.Logical formLearned from126 sentences. A heyday can be bygone.Logical formLearned from90 sentences. Ages can be bygone.Logical formLearned from63 sentences. A world can be bygone.Logical formLearned from58 sentences. A day can be bygone.Logical formLearned from43 sentences. Decades can be bygone.Logical formLearned from37 sentences. Centuries can be bygone.Logical formLearned from36 sentences. A generation can be bygone.Logical formLearned from24 sentences. A past can be bygone.Logical formLearned from23 sentences.