Study the verb To Be and then click on the links below to practise it:
If you want to read more about the verb clik here.
Now, let's practise:
1 http://www.englishexercises.org/makeagame/viewgame.asp?id=3053
2 http://www.englishexercises.org/makeagame/viewgame.asp?id=8298
3 http://www.englishexercises.org/makeagame/viewgame.asp?id=8301
4 http://www.englishexercises.org/makeagame/viewgame.asp?id=8262
5 https://es.liveworksheets.com/tz17515ip
6 http://www.englishexercises.org/makeagame/viewgame.asp?id=10678
7 https://es.liveworksheets.com/il387765lp
8 https://es.liveworksheets.com/xq1477859xg