Below are some two-part rhythmic frameworks I made up. I'm not notating pitches on staff, because I just want to focus on rhythm and meter, but I put some chord symbols in the 'bass' part to set a basic harmonic context.
The first two are straight forward using even divisions and emphasizing strong beats 1 and 3.
The third uses an uneven division. Is there a name for this? Syncopation, because it emphasizes the weak fourth beat? It's kind of like a feminine ending, but it isn't necessarily a cadence.
The fourth one is where my main question lies. In measure 2 the chord change is at beat 2 and then the chord is repeated with a half note on beat 3. Should I consider the emphasis to be on beat 2 or 3? Is this syncopation? Is it just a poorly articulated phrase in 4/4 meter?
I guess I'm trying to develop some confidence about when I am syncopating deliberately or I have a bad sense of rhythm & meter.