posted by rfvv .
1. She is talking with her friend in a boat/on a boat. (Which preposition should we use?
2. They are jumping from the ground.
3. They are jumping on the ground.
(Which preposition do we have to use? Are both OK?)
2 and 3 -- both are OK, depending on what is meant.
2 means they are jumping upward (from).
3 means they are jumping downward (on, as if from above).
or 3 means they are jumping up and down on the ground, not on a trampoline or anything like that.