不能不懂！想想自己一天講幾次:因為, 由於...because, for, due to, because of, since! 技巧：不用全會, 至少選兩個弄懂。
1. because 是導致某結果的直接原因，一般是有這樣的因才有那樣的果。We didn’t enjoy the day because the weather was so awful.
2. for 通常是先果後因，一般前面是猜測，後面for提供依據。for 引導的子句一般不放在句子的開頭。
It must have rained last night, for the ground is still wet.
We listened eagerly, for he brought news of our families.
3. due to 向來是形容詞，作介詞不是傳統用法，而作容詞的due to只可用在be (或is、was等be的變體)之後，例如﹕
His failure was due to his laziness.
“Due to his laziness (adjectival phrase)" is modifying “his failure."
4. because of 是複合介詞，其後接名詞、代詞、動名詞、what 從句等。*
I feel cold now because of the freezing AC.
“because of the freezing AC (adverbial prepositional phrase)" is modifying/explaining “I feel cold now."
*due to + 名詞 = because of + 名詞
In modern English, due to n. = because of n.; however, some grammar nazis may hunt you down and lecture you for hours if you commit this “mistake."
Source: http://words.journalism.ku.edu/because.html
5. since 多為陳述性的事實，相當於“既然”：
Since you are busy, I will go without you.
Since the earth is round, why don’t we fall off it?
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