Надо предложение : i read a book склонить simple : (to) present: past: future: continuosus (to be) present: past: future: perfect (to have) present: past: future: например вот так ! разделяйте simple : (to) present: i use a computer past: i used a computer future: i will use a computer continuosus (to be) present: i am using a computer past: i was using a computer future: i will be using a computer perfect (to have) present: i have used a competer past: i had used a competer future: i will have used a competer