👆 點擊每個句型標題，展開「公式 + 例句 + 常見錯誤 + 統測重點」。
句型一｜not only A but also B（不僅…而且…）▼
S + not only + V/adj. ... but also + V/adj. ...
（A、B 詞性與結構須對等）
These creatures
not only were beautiful
but also had heavenly voices.
這些生物不僅美麗，還有天籟般的歌聲。（課文）
✗ not only...but also 連接的兩部分結構不對等；also 不可省略時勿改成 and。
句首倒裝：Not only were they beautiful, but they also had lovely voices.（Not only 置句首要倒裝）
句型二｜as if / as though + 過去式（假設語氣）▼
S + V(現在) + as if + S + 過去式 / were（與現在事實相反）
They believe they can conquer competitors
as if they
were the goddess.
他們相信能征服對手，彷彿自己就是女神。（課文）
They look at products
as if they
shared magical qualities.
他們看待產品，彷彿產品擁有魔力。（課文）
as if 表「與事實相反」時用過去式；be 動詞一律用 were（✗ was）。
as if + 過去完成式（had + p.p.）則表「與過去事實相反」。
句型三｜強調句（分裂句）It is ... that ...▼
It is / was + 被強調部分 + that (who) + 其餘句子
It is the company's logo
that comes from Greek mythology.
來自希臘神話的正是這家公司的商標。（課文）
原句：The company's logo comes from Greek mythology.
強調主詞 the logo。
強調人可用 who；被強調部分若為時間/地方，仍用 that（勿用 when/where）。
與虛主詞 It is + adj. + that 不同：強調句拿掉 It is...that 仍是完整句子。
句型四｜關係代名詞補述用法（, which / , who）▼
先行詞 + , which / who + 補充說明（非限定）
Starbucks was founded in Seattle,
which is one of the largest seaports.
星巴克創立於西雅圖，那是最大的海港之一。（課文）
補述用法前面要加逗號，且不可用 that（✗ Seattle, that is...）。
, which 可代替前面「整個句子」：She passed, which surprised everyone.
句型五｜分詞構句（時間副詞子句省略）While + V-ing▼
While / When + V-ing ..., S + V ...（＝ While S + was V-ing）
While looking through some books, the designer came across a siren.
翻書時，設計師偶然看到海妖。（課文）
=
While he was looking through some books, the designer...
還原副詞子句。
省略時主詞須與主句相同；主動用 V-ing、被動用 being + p.p. 或直接 p.p.。
此結構常保留 While / When / After 使語意更清楚，統測綜測常考。