1、There be结构。
例句：There i no ene(道理)in leaving important deciion to inexperienced people.
2、It 结构。
例句：It i neceary that young and old people hould communicate more with each other.
It took the human race million of year to attain that record.
3、递进式结构。
例句：They do not eem to like one anther very much. Neither are they too keen on conventional people (正统的人).
4、主语从句结构。
例句：What make it rather diturbing (令人烦恼) wa the arbitrary circumtance both of my arret and my ubequent fate in court.
5、中间段落拓展句型。
描述原因的句型：due to /becaue of /for the reaon that
The chief reaon why… i that …
描述结果的句型：Thu/Aa reult/So/Conequently/Hence/Accordingly/Thereby…
论证说明句型：It i obviou / apparent/ clear/ conpicuou / without doubt that…