동사의 3단변화(비교)

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 r6 vs r7
 ...
  * take-took-taken
  * write-wrote-written
  * see-saw-seen
- * am(is, are)-was(were)-been
+ * be(am, is, are)-was/were-been
  * think-thought-thought
  * rarena-rarena-rarena
  * come-came-come
 ...