Spoken vs Written English: How do they differ?

There must be many differences. Here is my first observation: it seems to me that we write in sentences but we do not speak in sentences. Do you agree?

formal & informal, it''s as simple

They wouldnâ?Tt pay much attention to grammar when we speak, just try to answer clearly and fluently, thatâ?Ts enough. And one of the most obvious thing, in spoken English we can ask the interviewer and make it a friendly conversation while in written test we canâ?Tt.

moonlight

1. Structually, spoken is much simpler.
2. Spoken is heavily reliant on context.