Year 1: Grammar, Units 1 + 2

Check this out:

Present simple
http://www.learn-english-online.org/Lesson11/TestIt/TestPresSimple.htm
http://www.learn-english-online.org/Lesson12/TestIt/TestPresSimpNeg.htm
http://s132633050.websitehome.co.uk/Present%20Simple-%20Questions.htm
http://perso.wanadoo.es/autoenglish/gr.presim.i.htm.es/autoenglish/gr.presim.i.htm

A/an
http://www.mansioningles.com/Gram01.htm
http://www.mansioningles.com/gram01_ej1.htm

This, that, these, those
http://www.mansioningles.com/gram23.htm
http://www.mansioningles.com/gram23_ej1.htm
http://www.ompersonal.com.ar/ELEMENTARY/unit1/page5.htm

Regular Plurals
http://web2.uvcs.uvic.ca/elc/StudyZone/330/grammar/plural.htm

Possessives
http://www.mansioningles.com/gram18.htm
http://www.mansioningles.com/gram18_ej1.htm
http://a4esl.org/q/f/z/zz18mdf.htm
http://www.oup.com/elt/global/products/inenglish/starter/a_grammar/ine_starter_grammar06/

If you need more practise on any other grammar points, don't hesitate to tell me.