Good websites for learning English

ESL blues
angelfire
english-grammar-lessons
visualesl
englishonline France
usingenglish.com
Grammar Quizzes
learnenglishfeelgood
learn4good
resources

More conditional sentences

Try this multiple-choice exercise on conditionals.
Another one.
Here's another one.
Here's an exercise with pictures.
Here's another one with pictures.
Try this one.
You can find many more conditional exercises on this page.
Here's an exercise on second conditional.

Conditional sentences

Try all the exercises on this page.

Past Perfect Simple

Look at examples of rules here.
Now try this exercise.
Now try these negative sentences.
Now try these questions.
Here are some mixed exercises.
This list of irregular verbs may be useful.
Try this test.
Here is another test.