Here’s a short worksheet I made for my FCE students to practise different forms of the infinitive ready for the Use of English Key Word Transformations.
We worked through it together and talked about the different forms – it does need a little more explanation than is given on the sheet. I used this webpage as inspiration for the sentences. It was one of the only ones I could find explaining more than just the base and perfect forms of the infinitive. If anyone has any other links or online exercises, please let me know.
Feel free to download the sheet and use it with your own students:
[To download, click ‘view on slideshare’. You may have to log in (not sure), but it’s completely free. You should then be able to click on ‘download’ above the document.]
Enjoy!
Sandy Millin 
One thought on “Forms of the infinitive: FCE Key Word Transformations”