The hardest for me, are the jargon terms and instruments' names. The simplest are the most common words and expressions-like salutations-, they are easy to pronounce and easy to recall.

communication and managmnt responsability

I think the hardest part of English is the silent letters.

actually i have problem with the idioms, the jargon terms and the instrumentals items , because i do not practice them in talking so much so even with memorizing i forget them soon (it is all the matter of practicing not more) . the easiest one are the common words , conversationals items , beacuse we use them frecuently or we hear them much than the others .

As i'm in the begining of learning english , i can say that there is many words i dont understand in english.....But by the way the words of greeting and how to introduce myself is easier than any else words