1、PATTERNS1. happen to do . when .原句展示 I happened to be upstairs at dusk when the window was open. (P2)点拨 句中的happen to do . when . 为常用句式，意为“什么时候恰好发生什么事情”。如：She happened to be out when we called. 仿写 _（当门铃响时我碰巧在洗澡。）2. It be the first (second / third .) time . (that).原句展示 .; it was the first time in a ye
2、ar and a half that Id seen the night face to face . (P2)点拨 It be the first (second / third .) time . (that) . 是一个固定句型，意为“是第一（二 / 三）次”。该句型中的that 从句用完成时态。如果主句谓语是一般现在时，后面从句用现在完成时态；如果主句是一般过去时，后面从句则用过去完成时态，该结构中的that 可以省去。如：It is the first time I have been here.比较 It is high time (time / about time) (that
3、) + 主语 + did + 其它。该句型中that从句常用过去时，译为“是（正是）的时候”。如：It is high time that we went home.仿写 _（这是我第一次来这个美丽的山村。）3. It be + no + 名词 + doing .原句展示 Its no pleasure looking through these any longer because nature is one thing that really must be experienced. (P2)点拨 It be + no + 名词 + doing .是一个常用句型。可以把It看作形式主语，d
4、oing . 是真正的主语。常见的句型有： It be (no) fun / use / good . doing .。如：It is no good doing what you dislike. 仿写 _（做错事后悔是没有用的。）PATTERNS:1. I happened to be taking a bath when the doorbell rang.2. It is the first time that I have been to this beautiful mountain village.3. It is no use regretting after you make mistakes.
