1)build. built. built. 2)see. saw. seen. 3)forget. forgot. forgotten. 4)shake. shook. shaken. 5)read. read. read. 6)be. was,were. been. 7)fly. flew. flown. 8)bring. brought. brought. 9)buy. bought. bought. 10)find. found. found. 11)meet. met. met. 12)wake (up). woke(up),waked(up). woken(up),waken(up). 13)steal. stole. stolen. 14)burn. burnt,burned. burnt,burned. 15)lead. led. led. 16)become. became become.