6、did】am/is---wasare---were二、一般过去时的结构注意:1.did和didn’t是构成一般过去时的助动词,其特点是要在其后跟动词的原形。2.实意动词do的一般过去时I do my homework everyday.(用yesterday改写句子)I ____my homework yesterday.I _________ my homework yesterday.(否定句)____ you ____ your homework yesterday?Yes,Idid. /No, Ididn’t.(一般疑问句)They______(have)ag