In Present perfect^x, Perfect progressive^x, Writing letters^x

1.Is there any difference between "present perfect tense" and "present perfect progressive tense"? E.g. "I have lived here for 6 years." Vs. "I have been living here for 6 years." I think they are almost the same? 2. I think the difference between "all morning" and "this morning" is: "all...

CalifJim has written an excellent summary here. May I just add a couple of observations of my own. CalifJim wrote:You may be driving yourself crazy trying to make every sentence with a present perfect tense fit into one those three categories! I have written six letters this morning.This...

The most natural are 1a, 2a, 3b, 4a, 5a. 2b is incorrect. An adverbial indicating a point in time ("when I was cutting onions") is incompatible with the perfect aspect. I've been cutting onions ("continuously until now" implied). That's why my eyes are red ("now" implied). I have cut the...