Some different philosophical schools of thought include existentialism, which focuses on the individual's freedom and responsibility; utilitarianism, which emphasizes maximizing overall happiness; and stoicism, which teaches acceptance of what cannot be changed and living in accordance with reason.

It is not grammar or vocabulary. It is a philosophical reference.

The dichotomy is the surrounding view of self that we act out of. It is often learned with language and not taught [like the alphabet and numbers are taught] in early life through language and the forming of distinctions.

The Subject/Object dichotomy is related mostly to the Cartesian model of a 'self'. We can be both the subject that we observe, and the object doing the observing.But it goes beyond that into how we view the world we are in. In balanced thinking, we are both subjective and objective about situations and interactions in daily life, internally and externally. In unbalanced thinking, there is a tilt towards one side or the other. That is, either too subjective; as relating everything to how it affects you personally, [temperamental and self center] or, too objective; not having a sense of who you are in regards to what is occurring, [aloof, distant and apathetic]. It is related in Western philosophy as the basic nature of dualism. How do you know that you learned to live in a subject/object dichotomy?

The core of Cartesianism is that you have a mind: a separate function of your'self'. If you have an invisible self called a mind - you are in the subject/object dichotomy. Non-dualism is mostly learned in Eastern philosophies and will refer to the mind as an integer of the self - not separate from it.

You can not jump from one to the other. And, they both must be learned as referential contexts to who 'you' are in the world you live in.