表示因果關系的并列連詞。

主要有 for(因為), so(因此)等。如：

He shook his head, for he thought differently. 他搖了搖頭，因為他有不同想法。

He told me to do it, so I did it. 他讓我這樣做，于是我就這樣做了。

The child had a bad cough, so his mother took him to the doctor.

這孩子咳得很利害，所以他媽媽帶他去看醫生。

You are supposed to get rid of carelessness, for it often leads to serious errors.

你們一定要克服粗枝大葉，因為粗枝大葉常常引起嚴重的錯誤。

注意：for表示結果通常不能放句首，也不能單獨使用。

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