高二英語教材知識點總結及重難點解析Unit19-20
(2) due to 作“起因于、歸功于”時，常作表語或跟在名詞后。mistakes due to carelessness may have serious results.粗枝大葉造成的錯誤可能帶來嚴重后果。/ the team's success was largely due to her efforts. 該隊的成功在很大程度上是由于她的努力。
(3) because of “由于、因為”，在句中作狀語或表語。his anger is because of your bad deeds. 他是因你的失禮行為而生氣。
(4) owing to “由于、因為”，常在現代英語中與because of，due to換用。owing to unfavorable weather, i was unable to carry on with it. 由于天氣不好，我不能把它進行下去。
2. pay back, pay off, pay for
pay back是“償還，報復，報答”的意思
pay off是除“還清”的意思外，常用的意思還有“有報酬”
pay for是“付……款”的意思。
how can i pay you back for all your kindness? 你的這番好意我該怎么報答呢? / soon they paid off the loan. 不久他們把貸款還清了。/ his hard work paid off when he got the promotion. 他得到了提升，他的努力沒有白費。/ do you have to pay for your schooling? 你上學要付學費嗎?
3. announce, declare
這兩個詞都含有“宣布”的意思。其區別主要是：
announce 所宣布的是公眾較感興趣的事情，常帶有“預告”的意思
declare 一般用于較為正式的場合，特別是用于官方場合。例如：it has been announced that they will be married next week. 據宣布，他們將在下周結婚。the price of rice was announced in the papers. 大米的價格已在報上公布。declare war 宣戰 declare peace 宣布和平 the arrested man declared himself (to be) innocent. 被逮捕的人聲稱自己是無罪的。
declare 還有一個重要的意思是“申報 (納稅品、房地產等)，例如：do you have anything to declare? 你有什么要申報納稅的嗎?
4. combine, connect, join, unite
此組動詞意為“聯合、連接”。
(1) combine 意為“結合、聯合”，指為了某一目的而把兩事物結合在一起。we must combine theory with practice. 我們必須把理論和實踐聯系起來。
(2) connect “連接”，指用東西把兩事物連接在一起，或兩事物直接相連，二者仍保持原狀。the two cities are connected by a railway. 兩座城市由鐵路相連。
(3) join 意為“連接”，指以線、繩、橋等把兩物或兩地連接在一起，和 connect 意思相近，也可指兩物互相緊密相接。we had better join the island to the mainland with a steel bridge. 我們最好建一座鋼筋橋把這個島與大陸連接起來。/ where does this stream join the changiiang river? 這條河和長江在哪里匯合?
(4) unite 意為“聯合”，指兩種以上的事物結合為一體，有合二為一的意味，強調結合后的統一性。the two companies will unite into one. 這兩家公司將合并成一家。/ the whole family united to help him. 全家齊心協力幫助他。
5. worth，worthy
(1) worth adj. 價值……的 a car worth $XX0 價值2萬美元的一輛小汽車 how much is this bicycle worth? it's worth ￡50. be worth doing 值得一做 it isn't worth waiting for him. (值得……的)