Start off with Joe Davis's site http://www.telescopictext.com/
I ask students to describe what the tea could taste like, write some answers above the text, then click on the word 'tea'. New text will be inserted into the sentence.
The next day we can look at this website which is based on Joe Davis's site http://basseq.com/fun/telescopictext/
Now we can add our own words by replacing the text that is already there by highlighting the word to be changed, click on Replace, type new word and then click on Submit changes.
Word Magnet site.
Type in a sentence. When you type in the full stop make sure there is a space between it and the last word.
In the next window you can choose from many different backgrounds but for my editing lesson I will keep to a blank page
Click on Done and the next page will appear with your text broken up into text boxes. Click and drag them up to make a sentence.
Now start adding new words by typing in the 'Add new magnet box', once you have clicked the + symbol, click on a colour to change the colour of your text box. Drag it into the correct place. Use the colour coding to identify adjectives, conjunctions etc.
This will work well with just a projector and computer, but the Interactive Whiteboard would allow students to take over the manipulation of text and objects.