Conditionals

Here you can find some information and exercises on conditionals.
Here you can find information and exercises on the same topic along with the key for the exercises. (Source: English Grammar in Use. Intermediate by Raymond Murphy)
Here you can find more mixed exercises on conditionals as well as other linking words that can be used in conditionals. There are also some exercises on expressing wishes.

Modal verbs

Here you can find some information and exercises on modal verbs along with the key for the exercises. (Source: English Grammar in Use. Intermediate by Raymond Murphy)
Here you can find more exercises on modal verbs.

Past continuous and past perfect

Here are some mixed exercises with past continuous and past perfect in addition to the tenses we had seen earlier:

http://www.englishpage.com/verbpage/verbs3.htm

http://www.englishpage.com/verbpage/verbs4.htm

http://www.englishpage.com/verbpage/verbs11.htm

http://www.englishpage.com/verbpage/verbs12.htm

Schuman Square

Here you can find the webpage for the Schuman Square renovation.

Simple future

Here are some links for exercises on the simple future:

http://www.englishpage.com/verbpage/verbs18.htm

http://www.englishpage.com/verbpage/verbs19.htm

http://www.englishpage.com/verbpage/verbs20.htm

http://www.englishpage.com/verbpage/verbs21.htm

http://www.englishpage.com/verbpage/verbs22.htm

Comparative and superlative

Here you can find some information with exercises on comparative and superlative. Here is the key to the exercises.

Relative, -ed and -ing clauses

Here you can find some exercises on relative, -ed and -ing clauses along with the key.