ものですからBecause, My excuse is, My explanation is

Both ので and ものですから・もので give reasons or explanations. ので is normally more objective and direct, used to state that fact (A) is the reason for (B). ものですから・もので is used to express more personal or emotional reasons for actions. Note that ですから is primarily used in polite speech.

Both から and ものですから・もので express reasons or explanations. から is more straightforward and commonly used, similar to '(A), so (B)' in English. ものですから・もので places more emphasis on the reason, often used to explain one's own actions. Note that ものですから is more polite, while から is used in more casual speech.

All mean because, but nuance differs. ものですから is the most polite. ものだから is plain and often explanatory. もので is slightly softer and less direct. For example: 遅れたのは事故にあったものですから (I was late because there was an accident).

These expressions also share the same root as もの・もん, but differ in tone and formality. もの・もん is casual and subjective, typically used for personal justifications like 'cause (A)'. ものですから or もので adds a more objective or polite tone, and is commonly used in formal or semi-formal situations when offering explanations or justifications for one's actions or circumstances.

While both expressions contain もの, they are used with very different nuances. ものですから・もので offers a reason, and is often used to explain or justify one's personal actions or situation, e.g. 忙しかったものですから 'I was busy, so...'. In contrast, ものだ is used to express a natural tendency or general truth, e.g. １２月は仕事が忙しいものです ('Work is busy in December.', implying that's just the way it is).

These phrases are similar in that both express a reason, but they differ in tone and usage. なぜなら〜から provides a clear, objective explanation for something just mentioned. ことだから is often used in expressions like '彼のことだから', meaning 'because it's him', highlighting a reason based on someone's typical behavior or the nature of a situation.