Personal pronouns exercises

Here's a list of exercises you can do:

1. This exercise is very easy, it's about subject pronouns. 
2. And this one here is also only about subject pronouns. You must do sentences 1-10, but you can't do any more. Remember that the objective is to do object pronouns exercises!
3. What about this exercise? It's a list of 20 sentences and you only have to write down "S" if it's a subject pronouns, "O" if it's an object pronoun. You can DIVIDE the exercise in groups of 10 sentences.
4. This other exercise is a bit more difficult: it combines subject and object pronouns (see bottom of the page).
5. In this exercise, you use lots of object pronouns and some subject pronouns. You can DIVIDE it in groups of 6 sentences.
6. This exercise is very good and will tell you if you really understand how object pronouns work. You can divide it in groups of 5.