Ferns can be extinct.Logical formLearned from2 sentences. Sharks may be considered extinct.Logical formLearned from2 sentences. Blondes can be extinct.Logical formLearned from2 sentences. Leopards can be extinct.Logical formLearned from2 sentences. A human race can be extinct.Logical formLearned from2 sentences. A product can be extinct.Logical formLearned from2 sentences. (Minority languages) can be in danger of extincting.Logical formLearned from2 sentences. Golden (lion tamarins) can be extinct.Logical formLearned from2 sentences. A shark can be extinct.Logical formLearned from2 sentences. Some (vegetable varieties) can be extinct.Logical formLearned from2 sentences. A (passenger pigeon) may go extinct.Logical formLearned from2 sentences. Lines may go extinct.Logical formLearned from2 sentences. Mutants can be extinct.Logical formLearned from2 sentences. Some frogs can be extinct.Logical formLearned from2 sentences. A chestnut can be extinct.Logical formLearned from2 sentences.