Some, all or none
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What you will learn
By the end, you can tell what must be true from sentences about all, some and none.
A detective writes down three facts. From the facts, she works out what must be true — no guessing, only logic. Can you do the same?
Read the explanation
“All birds have feathers” means every single bird has feathers. So if a robin is a bird, the robin must have feathers — that is guaranteed. “Some” means at least one, not all. “None” means zero.
- “All” covers every single one.
- “Some” means at least one — maybe not all.
- “None” means zero.