posted by rfvv on .
1. They move only 2 meters an hour.
2. They move only for 2 meters an hour.
3. They move for only 2 meters an hour.
(Are all grammatical?)
#1 is referring to speed or distance per hour.
#s 2 and 3 seem to be referring to how many hours (a day?) " they" move around or are active.