【动词过去式后用be动词如何变形?比如说我应该说thecurtainIpickedwasablackishcurtain还是thecurtainIpickedisablackishcurtain?还有如果我用has的话是thecurtainIpickedhasablacktone还是thecurtianIpic】

　　动词过去式后用be动词如何变形?

　　比如说我应该说thecurtainIpickedwasablackishcurtain还是thecurtainIpickedisablackishcurtain?

　　还有如果我用has的话是thecurtainIpickedhasablacktone还是thecurtianIpickedhadablacktone?