Only in 1996, Ford sold a rebadged Mazda 626 GV over here as its rebranded Japanese mid-size stationwagon. (1996 was the only year)
Not exactly. More precise meaning would be Until 1996 Ford did not sell a...
In 1996, only Ford sold a rebadged Mazda 626 GV over here as its rebranded Japanese mid-size stationwagon. (Ford was the only manufacturer)
Correct.
In 1996, Ford sold only a rebadged Mazda 626 GV over here as its rebranded Japanese mid-size stationwagon (i.e. it was the only rebranded Japanese stationwagon from Ford)
No. The rebadged Mazda was all he ever sold that year (poor Mr.Ford...)
In 1996, Ford sold a rebadged Mazda 626 GV over here as its only rebranded Japanese mid-size stationwagon (there were no others, I assume?)
Here it's exactly what you said in your previous example. Mazda 626 GV was the only rebranded Japanese stationwagon from Ford
In 1996, Ford sold a rebadged Mazda 626 GV over here as its rebranded Japanese mid-size stationwagon only (but not as a hatchback or saloon)
Correct.
Just 3 weeks ago, there was a sudden snowfall (3 weeks ago recently?)
More or less.
3 weeks ago, there was just a sudden snowfall (no other natural disaster?)
Correct.
3 weeks ago, just there was a sudden snowfall (no other location)
Correct.
3 weeks ago, there was a just sudden snowfall (?)
The only meaning I can fathom for this usage is Suitable or proper in nature; fitting (and only after consulting the Free Dictionary, my first thought was just in the meaning of honorable/righteous).
Grammatically they all seem fine.
Not sure if that's exactly what you were looking for, but I would write something like
Please do not hesitate to contact me again if you require further
assistance.
Best Answer
They are both correct phrases. Apparently "checking on me" has an older lineage, but in modern English, either is appropriate (in the US anyways).
"Checking in", it could be argued, has a connotation of the speaker being physically present, as in someone coming to visit or a parent or nurse looking into your room. However, the distinction is small enough to be irrelevant — no one I know would fault you for using it in a letter.