Concept:Use Venn diagram reasoning for syllogisms.
Explanation:From "All coins are crows": the set of coins is completely inside the set of crows.
From "Some crows are pens": the sets of crows and pens overlap.
The overlapping part between crows and pens may or may not include coins.
Thus, we cannot conclude that "No pen is coin" (conclusion I) is definitely true.
We also cannot conclude that "Some coins are pens" (conclusion II) is definitely true.
Therefore, neither conclusion follows.
Answer:If neither I nor II follows.