Enigma 7 - What am I?

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Across
  1. 2. past simple of the verb "to drive"
  2. 4. past participle of the verb "to eat"
  3. 6. past participle of the verb "to freeze"
  4. 8. past simple of the verb "to teach"
Down
  1. 1. past simple of the verb "to ride"
  2. 2. past participle of the verb "to drink"
  3. 3. past participle of the verb "to sing"
  4. 5. past simple of the verb "to think"
  5. 6. past simple of the verb "to fly"
  6. 7. past participle of the verb "to ring"