now that you said that , it might make more sense to use audio tapes not the type that are teaching a language , but just audio books that you could listen to while on a train or driving or just relaxing during your lunch breaks.

when I get an email concerning any type of business and I find these small insignificant literary errors this causes my mind to throw up warning signs and into the recycle bin they go.

If I were to go to a forum that uses your native language
I would have to use some type of translator or something
so I can definitely understand that it is difficult to say the least.
3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.