4th CAL verb tenses

As some of you had some doubts about time tenses usage yesterday, here you are some on line exercises to practice on them:

- Present perfect and simple past

- Present perfect and present perfect continuous: you have one exercise here and another exercise here.

These were only to practice a little more. If you want to see further explanations on that, here is a very good grammar explanation for present perfect simple vs. continuous and then you can do tests 1 and 2. For the difference between present perfect and simple past you will find the grammar explanations here and you can do tests 1, 2 or 3 to practice on it.

Let me know if you found them useful!