irregular verbs

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Across
  1. 2. the first form of "кусать"
  2. 3. the third form of to do
  3. 4. the third form of "начинать"
  4. 5. all three forms of this verb are the same
  5. 6. the second and the third form of to catch
  6. 7. the second and the third form of "иметь дело с"
Down
  1. 1. the second form of to be
  2. 2. the second form of "бить"
  3. 4. the third and the second form of "покупать"
  4. 7. the second and the third form of "копать"