He was so busy that he forgot____the letter____his parents.请

He was so busy that he forgot____the letter____his parents.请 he was so busy that he forgot washing his chothes He was so busy that he couldn't go to the concert.（改成同义句)He he was so busy that he couldn't goto the concert.改为同义句 怎么改? He was so busy that he couldn't go to the concert.（改成同义句) He was so busy that he couidn't go to the concert[改为同义句] He was so busy that he could not have a rest.改为同义句 1)so busy is he that he can not have a holiday,2)so busy he the professor was so busy that he culd hardly find any time Hs was so busy that he didn't answer my letter.(同义句转换） Ricky was so busy these days that he didn’t write to Kitty e He was busy yesterday.