because

　　(1)從屬連詞,意為"因為",表示直接原因,用來回答why引導的疑問句.

　　-Why was he late for school?他上學為什么遲到了?

　　-Because he got up late.因為他起床晚了.

　　-Why did the girl go to school on foot today?

　　那個女孩今天為什么步行去上學?

　　-Because her bike was broken.因為他的自行車壞了.

　　(2)漢語里"因為…所以…",在英語中卻不能把because 和so連用在一起,在句中只能用其中一個.

　　I can't help you because I'm too busy today.

　　He was ill, so he didn't go to school yesterday.

　　(3) because可構成詞組because of,意為"因為,由于",后面接名詞,名詞詞組或代詞等.

　　I had to stop the work because of the rain.

　　The girl fell off her bike because of her brother.

　　because / since / as / for

　　四個詞均表示原因,都是連詞,其中because,since as為從屬連詞,引導原因狀語從句,for為并列連詞,一般不引導狀語從句.四個詞的語氣由強至弱依次為because → since → as → for

　　(1)because意為"因為",表直接原因,回答why引導的原因狀語,引導從句多用于主句之后.

　　(2)since意為"既然,由于",側重主句,從句表示已知的理由.

　　(3)as 意為"由于,鑒于"主句說明結果,從句說明原因.

　　(4)for意為"因為,由于",表示附加或推斷的理由.多用逗號隔開,一般不放在句首.

　　My father went to work on foot because his bike was broken. 我父親步行上班因為他的自行車壞了.

　　As it is raining now,let's go home.

　　既然天在下雨我們現在回家吧

　　Since he is new here,he looks strange.

　　由于他是新來的他看上去很陌生

　　Why do you like tigers? ______ they're cute.

　　A For B Since C Because D As

　　see

　　作動詞意為"看見",強調看的結果. 還可表示"想一想,明白"之意

　　Can you see the book on the desk?

　　This is my book It isn't your book. Do you understand?

　　oh,I see.

　　look see watch

　　(1)look為不及物動詞,后面接賓語時需加介詞at,強調看的動作. look at = have a look at

　　Look at the blackboard, please.請看黑板.

　　(2)see強調看的結果,多與情態動詞can連用.

　　Can you see the map on the wall?

　　你能看見墻上的地圖了嗎?

　　(3)watch意為"觀看,",表示注重某種動作.

　　Our classmates are watching the football match on the playground. 我們的同學們正在操場上觀看足球比賽.

　　Let's _______ a film.

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