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新一轮中考复习备考周期正式开始， 一般现在时的构成： 1)肯定形式：S+动词原形（v.）或 单三形式 (v.s/v.es)+O. 2)否定形式：S+助动词do not/ does not+动词原形+O. 3)疑问形式：助动词Do/Does +S.+动词原形+O. 例如： I often help my parents do housework at home. Tom often helps his parents do housework at home. Sometimes Lucy washes her clothes herself. (责任编辑：admin) |