複合句的兩個子句具有「從屬關係」，因此僅能使用If, when, because, although開頭的從屬連接詞作為從屬子句 + 主要子句。
注意:
So是對等連接詞，以so開頭的句子就沒有從屬關係。
I like Mary because she is nice. = Because Mary is nice, (註) I like her.
註: 絕不可加so
Although也不可與but連用
Although I am poor, (註) I am happy.
註: 絕不可加but
對等連接詞
So是表示因果關係，as, but, so, for, yet (當連接詞時)前面一定要有逗點。
對等連接詞前面不可用句點。
We must start early, for it will take two hours to drive to the airport.
It is hot in summer here, but it is not cold in winter.
I don't know him, yet I can get his help.
For = because
對等 從屬
從屬連接詞
同一個句子內，有because就不可有so，有although就不可有but。
從屬連接詞開頭的子句叫「從屬子句」。
從屬子句擺在句子前面要加逗點，若放在主要句子後面不可加逗點。
Ex: Because the weather is nice, I feel like going out for a walk.
= I feel like going out for a walk because the weather is nice.
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