1. Throughout the whole tortured history of their relationship, Elizabeth was eat up with curiosity about her cousin.

結構剖析：這是一個簡單句。主語是 Elizabeth，謂語是was eat up with curiosity about her cousin, Mary。在這個謂語中介詞短語 about her cousin做定語修飾curiosity，Mary做cousin的同位語。

句首的Throughout the whole tortured history of their relationship是介詞短語，表示時間。在這個介詞短語中tortured是過去分詞作前置定語，修飾history。

2. Mary trapped in a neurotic beauty contest, interrogating her ambassadors as if they were mirrors on the wall, as to who was the taller, fairer, wittier, the cleverer.

結構剖析：這個句子是一個含有分詞的復合句。句子的主干是Mary trapped in a neurotic beauty contest。

其余部分中的interrogating her ambassadors as if they were mirrors on the wall, as to who was the taller, fairer, wittier, the cleverer是現在分詞短語做伴隨狀況狀語。

這個現在分詞短語中含有一個讓步狀語從句，有as if引導的——hey were mirrors on the wall。As if的意思是“似乎，好像”，那么它引導的從句只是人的感覺，并非客觀現實，因此要使用虛擬語氣。文中的謂語were。

此外，as to是屬于介詞短語，意思是“關于”，這個介詞短語修飾分詞中的非謂語動詞interrogate。句中as to后面跟的是賓語從句：who was the taller, fairer, wittier, the cleverer。

3. Elizabeth may have won for brains, but from the few pictures we have of her, Mary, with her heart-shaped face, heavy eyelids and creamy complexion, evidently had the stuff to reduce grown men to warm puddles on the floor.

結構剖析：這個句子是有并列連詞but連接的2個并列分句。一個是：Elizabeth may have won for brains；另一個是：from the few pictures we have of her, Mary, with her heart-shaped face, heavy eyelids and creamy complexion, evidently had the stuff to reduce grown men to warm puddles on the floor。

第一個分句中使用了情態動詞的虛擬語氣，謂語結構是may have won這個表示對過去事情不是很肯定的猜測。

第二個分句中的 with her heart-shaped face, heavy eyelids and creamy complexion這個介詞短語做定語，修飾主語Mary，介詞with在這里的意思是“具有”。分句中的謂語是had the stuff to reduce grown men to warm puddles on the floor。這個謂語中有個動詞不定式修飾名詞stuff。