16. 一般过去时态 （a） be 动词的过去式:am,is---was, are---were I/He/she/it was(not)…. You/we/they were…. 一般疑问句was, were 放在句首。 （b）动词过去式： 肯定句： I watched cartoons. She visited the zoo. 一般疑问句： Did you read book last night? Yes, I did./ No, I didn’t. Did she clean the desk just now? Yes, she did./ No, she didn’t. 否定句： They didn’t go to the part yesterday. He didn’t make model ships last week. (3)动词过去式的变化： 规则动词的变化： 大多数动词 +ed 例如 planted,watered,climbed。 以 e 结尾的+d 如 like-liked。 以y 结尾的去y +ied 如 : study—studied 有的要双写后面的字母如: stop --stopped 不规则动词的变化： is/am—was,are—were,do—did,have/has—had, make—made,fly-flew eat—ate,take—took,run—ran, sing—sang,drink—drank 等等 本文来源：https://www.wddqw.com/doc/9614c62bb94ae45c3b3567ec102de2bd9605de16.html