Today I  worked with the 6ºth group the past simple. Is important for them. In this table there are the differents conjugations. I hope that this matertial can be interesting and useful to them

PAST SIMPLE.

Affirmative	Interrogative	Negative
I ate.	Did I eat?	I did not eat.
You ate.	Did you eat?	You did not eat.
He/She/It ate.	Did he/she/it eat?	He/She/It did not eat.
We ate.	Did we eat?	We did not eat.
You ate.	Did you eat?	You did not eat.
They ate.	Did they eat?	They did not eat.

The next link is very interesting. There are differents exercises about the past simple

 http://www.really-learn-english.com/simple-present-exercises.html