(单词翻译:单击)
It has been 4 years since I smoked.我戒烟4年了。讲解：smoke是过去式smoked，所以，这个吸烟的动作已经是过去的。千万不能理解成“我抽烟4年了”.我抽烟4年了的说法是 It has been 4 years since I started somking，或者 I've been smoking for 4 years。
