What does the phrase "an old friend" mean? What does the adjective "old" mean in this case? It seems to me this phrase refers to a friend we have known for a long time rather than a friend who is long-lived. If this is the case, what word should we use to refer to a friend who is not young? Thank you very much in advance!

"I think..." vs "I would think..." When expressing opinions, someone begin with "I think..." while others say "i would think..." What's the difference between these two sentences??? Thanks in advance!

hello world! This is my first day on italki, i'm a English learner, i'm trying to find a good place to practise writing English, i hope italki is where i'm seeking for. Thanks

What's the difference between the two phrases:"University of Economics" vs "Economics University"? Adjective phrase