exercises simple present exercise 1 exercise 2 exercise 1 exercise 2 present progressive present perfect exercise 1 exercise 2 exercise 1 exercise 2 present perfect progressive simple past exercise 1 exercise 2 exercise 1 exercise 2 past progressive past perfect exercise 1 exercise 2 exercise 1 exercise 2 past perfect progressive going-to-future exercise 1 exercise 2 exercise 1 exercise 2 will-future