評論
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語法透視：
1. Your own hands must benumb with cold.
該句子中介詞with的意思是：
because of (sth); on account of (sth) 因為或由于（某事物）
典型例子：
blush with embarrassment 因難為情而臉紅
tremble with fear 嚇得發抖
shaking with laughter 笑得渾身直顫
Her fingers were numb with cold. 她手指凍木了。
2. Do sit down, my dear.
本句話中do是助動詞，用來強調句中的謂語動詞(要重讀)，以加強語氣，此時謂語的時態由 do 來體現，其后的謂語動詞用原形。如：
He does speak well. 他的確說得好。
He said he would come and he did come. 他說他會來的，他果然來了。
以上用法若用于祈使句中，可使語氣更客氣友好或更有說服力。如：
Do sit down. 請坐請坐!
Do be careful. 一定要仔細。
【注】以上用 do 表示強調的用法只見于肯定句，不見于否定句或疑問句。如：
誤：You don't do look nice today.
誤：Don't do be careless.
3. I imagine her mother must have kept her up the entire evening.
該句話中的賓語從句“her mother must have kept her up the entire evening”使用了虛擬語氣。結構為must have done，這個結構表示對過去的事情的肯定猜測。
Must have done 是對過去發生的動作最有把握的猜測，意思是“一定”。例如：走到門外看到地上濕的，便猜“剛才一定下過雨了”，英語就是 It must have rained.
把握差一點的用should。例如：地上不是太濕，你猜“剛才應該下過雨吧。” It should have rained.
把握再差一點的用may。例如：It may have rained.剛才可能下過雨。
最不肯定的用might。例如：It might have rained。
