是: fly flew fiying become became becoming spend spent spending go went going see saw seeing eat ate eating have had having ride rode riding give gave giving do did doing
fly flew flying become, became becoming spend, spent spending go,went going see, saw seeing eat, ate eating have, had having ride, rode riding give, gave giving do did doing
第2个回答 2012-04-26
过去式 ing fly flew flying become became becoming spend spent spending go went going see saw seeing have had having give gave giving do did doing