Diamonds can be expensive.Logical formLearned from25 sentences. A contract can be expensive.Logical formLearned from25 sentences. An item can be expensive.Logical formLearned from25 sentences. Mistakes can be expensive.Logical formLearned from25 sentences. Planes can be expensive.Logical formLearned from25 sentences. Gold can be expensive for buyers.Logical formLearned from25 sentences. Medications can be expensive.Logical formLearned from25 sentences. Produce can be expensive.Logical formLearned from25 sentences. Solar power can be expensive.Logical formLearned from25 sentences. Tools can be expensive.Logical formLearned from25 sentences. Wars can be expensive.Logical formLearned from25 sentences. Restaurants can be expensive.Logical formLearned from25 sentences. Formula can be expensive.Logical formLearned from24 sentences. (Day care) can be expensive.Logical formLearned from24 sentences. (Borrowing money) can be expensive.Logical formLearned from24 sentences.