a few/ few/ a little/ little
Ⅰ. a few和few修飾可數名詞，a little和little修飾不可數名詞；a few和a little表示肯定意義，few和little表示否定意義，可受only修飾。如：
① Few people will agree to the plan because its too dangerous.
②This text is easy to understand though there are a few new words in it.
③ There is little water left in glass. Will you please give me some
④ Dont worry, we have a little time left.
about/ on
Ⅰt 關於表示的內容較為普通或指人時用它。側重於敍事，多用於敍述個人經歷和事蹟，故事內容涉及一些較淺的問題。是非正式用語。
You use about to introduce who or what something relates to or concerns.
She knew a lot about food.
He never complains about his wife.
Ⅱ 關於側重於論述政治理論，國際形勢，學術報告等。也就是説，當表示這本書，這篇文章或演説是嚴肅的'或學術性的可供專門研究這一問題的人閲讀時用。eg:
This is a text book on African history. 這是一本關於非州歷史的教科書。[注]：它們有時可通用。
He declined to give any information on the Presidential election.
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