:
http://www.mriya-urok.com/video/neopredelennaya_forma_glagola_infinitiv_glagoly_sovershennogo_i_nesovershennogo_vida_glagoly_okanchivayuschiesya_na_-tsya_-t_sya_-ch_-ch_sya_
http://www.kakprosto.ru/kak-96981-kak-opredelit-glagoly-sovershennogo-i-nesovershennogo-vida