What is the difference between "en" and "encima de / dentro de"?
How do you know which of these words to use? I have heard "en" being used to express the meanings of both "dentro de" and "encima de". For example: El profesor escribe en la pizzara. El libro esta encima de la mesa. Both of the bold words in these sentences mean "on", right? Does it matter which one you use? Could the two bold words be switched and the sentences still make sense?