1.一般情况下,直接在词尾加“-ing”.
2.以不发音的“e”结尾的,去掉“e”再加“ing”,如：have→having;
like→liking;take→taking;practice→practicing
3.词尾是一个辅音字母结尾的重读闭音节,先双写这个辅音字母,再加“ing”,如：stop→stopping；sit→sitting;put→putting;get→getting;shop→shopping;begin→beginning;prefer→preferring;travel→travel(l)ing; plan→planning.
4.以ie结尾的词,先将ie变为“y”再加“ing”,如：lie→lying；tie→tying; die→dying.
