I´ve been learning....

P.P. Continuous is a complex tense to use as sometimes we don´t know how or when it´s convenient to do it. Remember that we use it when we want to emphasize the process rather than the  result.

Here you are this grammar video lesson that explains some differences between the two tenses.
I hope it can help you!!

Extreme Adjectives

Extreme adjectives or non-gradable adjectives are words that mean “extremely + adjective” – for example, “freezing” means “extremely cold.” The weather can’t be “a little bit freezing” or “very freezing” – because the word “freezing” itself automatically means “extremely cold.”

Here you are a videoI have found and I think it can be useful

Enjoy!