To Ian, of Warsaw.
Ian, if you intend to continue teaching English, by the Callan method or by any other, please try to improve both your spelling and your usage: it's "ingrates'', not "ingreats"; "totally", not "totaly"; "old-fashioned', not "old fasioned"; "relevant", not "relivant"; "etc", not "ect"; "English", not "english"; "liberal", not "libral"; "don't", not "dont" -- and I think you mean "a few truths", not "few truths", but apart from this one example, I won't even begin the tedious task of correcting your usage.
You may think that I am a pedant or a snob or a combination of the two, but I feel I am a person who loves the English language and its capability for diamond-like precision, and I believe that it is simply wrong and most impolite to teach poor English to anyone.
It is easy to improve one's knowledge of the language, and skill in using it, by reading quality examples of it: I recommend this practice to you.