There are a lot of quantities between one and all. Furthermore, when talking about generalities for this topic there is either precise generalities or vague generalities. Precise generalities are statements that involve percentages and/or facts. Vague generalities are statements that are summarized mainly by using all, some, most, many, few and very few. Another way to explain vague statements is when a particular person talks about all or a part of a collection without specifying a precise number.
Despite the ambiguity of the words "all" and "some," we can still analyze whether arguments using those are valid or not. We do this with the direct way of reasoning with almost all. For example... Almost all S are P; a is S so a is P. Or, arguing backwards with almost all. For example... Almost all T are Q; a is T so a is Q.
To be honest, this topic is still a little confusing for me. However when I keep these few key points in mind then it helps me out a lot.
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