a. Form and usages: click here
b. Exercise 1: Click here
c. Exercise 2: Click here
d.Exercise 3: Click here
e.Exercises 4: Click here
a. Question forms: Click here
b. Exercise 1: Click here
c. Exercise 2: Click here
d. Exercise 1: Click here
a. Form of present perfect continuous: Click here
b. Form of present perfect simple: Click here
c. Exercise 1 present perfect continuous: Click here
d. Exercise 2 Present perfect simple: Click here
***Usage: Present perfect continuous V.S Present perfect simple: Click here
e. Exercise 1: Click here
f. Exercise 2: Click here
g. Exercise 3: Click here