一.动词的过去式的构成规则有:
A规则动词
①-般直接在动词的后面加ed:如worked , learned , cleaned , visited
②以e结尾的动词直接加d: 如lived , danced , used
B不规则动词
(此类词并无规则,须熟记)小学阶段要记住以下动词的原形和过去式:
sing-sang,eat-ate,see-saw,have-had,do-did,go-went,take-took
二.动词的ing形式的构成规则:
①一般的直接在后面加.上ing ,如doing , going , working , singing , eating
②以e结尾的动词,要先去e再加ing, 如having , writing
③双写最后一个字母的(此类动词极少)有: running , swimming , sitting。