Speech and the written language differ in many ways. Speech developed before writing and we learn to speak before we learn to write. For a long time there was no written language at all, and there are languages that have no written form. That is not to say we can say what we like and hope to be understood. Speech has its rules. In English, we must say, ‘Shut the door’ rather than, ‘Shut door the’ or ‘Shut of door’, and we must say ‘streets’ rather than ‘street, street’ when we mean more than one. Anyone who applies such rules consistently speaks correct English. The only people who don’t are those who have yet to learn them: infants and those who are learning English as a foreign language. …