問：小兒試卷有以下選擇題，愚以為應選longest，但其教師卻說shortest才正確。先生認為怎樣？──Many girls in my class have long hair, but Emily's hair is the longest/shortest。
答：這一句應選longest。全句是說：「我班裏不少女孩都留長頭髮，但頭髮最長的是愛蜜莉。」句中的long和longest可以相比較。至於shortest，卻無short字可以比較，並不妥當。要說「我班裏不少女孩都留長髮，但愛蜜莉的頭髮很短」，英文是Many girls in my class have long hair / wear their hair long, but Emily's hair is short / Emily wears her hair short。
問：以下一句，with a litre costing $1.3 可不可改為with $1.3 a litre？──Petrol prices were particularly high in January, with a litre costing $1.3（汽油價格一月分特別高，一公升賣一元三角）。
答：說每公升、公斤等的價錢或每天、每小時等的進度，英文會用at帶出，例如：（1）Beef is sold at around $50 per pound（牛肉每磅賣五十元左右）。（2）He was driving at 100 kilometres an hour（他以每小時一百公里速度開車）。讀者示下那一句，with a litre costing $1.3改為at $1.3 a litre也可以。
With則可用來帶出片語（phrase），其中名詞之後常用分詞（participle，即ing或ed動詞），例如：（1）With him helping us, we were able to finish the job（我們獲他幫忙，得以完成工作）。（2）He quietly passed away, with the letter still clasped in his hand（他安詳去世，去世時手裏還緊緊握着那封信）。With a litre costing $1.3就是這句式。