Assistance. Basic Grammar material.

I am helping a friend of my girlfriend improve her English. She has done some studying via the Callum method. Her pronunciation isn't bad and her intonation and stressing is good. However her grammar is awful.

I thought that I should start with some tenses as everything she says is in the present simple tense.

Does anybody have some material which might help her as I only have things for intermediate level and above and she is not at that level of understanding. If you have things scanned brilliant but if not book references and sections and I'll do the leg work.

Thanks

DP