Identify the error from the quotation words in the following sentence; if no error is found select 'No error' If frogs "was" to "become" "extinct" the snakes "would also die."

প্রশ্নঃ Identify the error from the quotation words in the following sentence; if no error is found select 'No error' If frogs "was" to "become" "extinct" the snakes "would also die."