You have been asked to use "though" without "even" because "even though" is a commonly overused phrase , particularly among children and ESL students! Dont stress, its quite simple.
"Though" is the modern spelling of old english "tho" , ( yay tho i walk through The Valley in the shadow of death.... etc!!) and its easier to understand in that context. Though (tho) learning another language is hard at times , it pays to persevere.
I dont always understand my teacher, though she speaks clearly and slowly to me.
The sun is shining, though knowing English weather it will change in a minute
It is a useful subsitute word to consider if you find yourself overusing the word "but" in sentence construction. Though dont over do it!!