I'm confused as to when one should use "can" and "could" before verbs such as "feel", "hear" and "see".
Does it make a difference in any way when you do include "can" or "could" in front of a verb of perception?
Here are some example of sentences using the perceptive verb "feel". Some use "can" before it, others don't. Does it make a difference to the meaning?
- I feel someone grab me from behind.
- I can feel his body tense next to mine.
- I feel a strange calm as I look at him.
- I can feel the anger boiling up inside me.