If what you want to do is learn more about cleft sentences, all you have to do is click here or here for an explanation and some practice (scroll down for the exercises).

More exercises here.

And a few more here, here and here.

If you need to know what participle clauses are, check out these BBC links: this one is easier and this one more advanced. Scrolling down, you'll find some activities to do. Here's a very clear and useful explanation by the British Council, with some exercises.

This is a very easy exercise to see the difference between a present (ing) and past (ed) participle.

More exercises: click here, here, here, here and here.

If feeling strong and energetic today, have a look at these great but quite difficult exercises.

You can try some exercises here, here and here.

This one is a little more demanding; click here.

Some verbs have many possible cololocations in English. Click here to practise the difference between do/make and say/tell and speak/talk. A list and activity witth collocations with take/do/have/take here.

Here you can learn some collocations with prepositions