Transport of the future!

In this unit we are learning to use PRESENT PERFECT CONTINUOS.

In this links you have some extra practice: 

http://curso-ingles.com/practicar/ejercicios/present-perfect-continuous

http://www.ejerciciodeingles.com/ejercicios-valor-continuativo-present-perfect-progressive/

http://www.perfect-english-grammar.com/present-perfect-continuous-exercise-1.html

http://www.perfect-english-grammar.com/present-perfect-continuous-exercise-2.html

http://www.englishpage.com/verbpage/verbs7.htm