This question already has an answer here:
I'm from a place where there is no "L" in the language, and it's always been tricky to say.
Well, I did some research and, at least for American-English, there are two types: A "light L" and a "dark L".
Individually, I don't have a problem, but putting the dark L together with another word is sometimes a challenge. For example, I'm uncertain about "all of". Out of habit I use a light L to say it similar to "olive", but from what I read (and correct me if I'm wrong), I think I'm supposed to use a dark L for "all". This is very uncomfortable to say.
What's the proper way to pronounce "all" and "all of"? Is there a difference when put together?
EDIT: I did some more research, and some sources say that the dark L also uses the tip of the tongue as well as raising the back of the tongue. It's possible that "all of" is used in this manner. "All of" and "olive" may be different after all.
The linked post Confusion of the pronunciation of Dark "L" consonant sound? does have some information, but it doesn't fully answer this question.
Tom says in the question that
Dark "L": is "L" at the end of the word or after a vowel sound. Example: ball, pull.
Light "L:: is "L" at the beginning or before a vowel sound. Example: light, love.
Araucaria says in an answer that
The rule for dark /l/ is that we always use dark /l/ when /l/ isn't followed by a vowel. So in the word falafel the first /l/ is clear, the second is dark.
But neither of these posts seem to say if the rule applies when a word ending in "l," such as "all," is followed by a word starting with a vowel sound, such as "of."