He writes a letter every day,doesn't he?He doesn't write a letter every day,does he?She worked hard yesterday,didn't she?She has never worked here, has she?They will play football next week, won't they?They won't play this game, will they?There is a book on the desk, isn'there?There are no toys in the bag, are there?I had read this book by six o'clock, hadn't i?I was sleeping all day long yesterday, wasn't i?