A period can be indefinite.Logical formLearned from3 485 sentences. A detention can be indefinite.Logical formLearned from3 156 sentences. An extension can be indefinite.Logical formLearned from1 794 sentences. A strike can be indefinite.Logical formLearned from1 645 sentences. A curfew can be indefinite.Logical formLearned from1 107 sentences. A leave can be indefinite.Logical formLearned from1 055 sentences. A future can be indefinite.Logical formLearned from961 sentences. A suspension can be indefinite.Logical formLearned from943 sentences. A hiatus can be indefinite.Logical formLearned from900 sentences. A hold can be indefinite.Logical formLearned from617 sentences. A number can be indefinite.Logical formLearned from536 sentences. A postponement can be indefinite.Logical formLearned from459 sentences. A duration can be indefinite.Logical formLearned from389 sentences. A time can be indefinite.Logical formLearned from379 sentences. An article can be indefinite.Logical formLearned from373 sentences.