A sky can be threatening.Logical formLearned from74 sentences. Nations can be threatening.Logical formLearned from74 sentences. Diseases can be threatening.Logical formLearned from72 sentences. A problem can be threatening.Logical formLearned from70 sentences. An event can be threatening.Logical formLearned from69 sentences. Forces can be threatening.Logical formLearned from68 sentences. Actions can be threatening.Logical formLearned from68 sentences. Mail can be threatening.Logical formLearned from68 sentences. A condition can be threatening.Logical formLearned from65 sentences. An activity can be threatening.Logical formLearned from65 sentences. (Text messages) can be threatening.Logical formLearned from64 sentences. Violence can be threatening.Logical formLearned from61 sentences. A female can be threatening.Logical formLearned from60 sentences. Attacks can be threatening.Logical formLearned from58 sentences. A country can be threatening.Logical formLearned from58 sentences.