When I learnt English grammar I was told that some of the senses don't get "ing" of present continuous, therefore we should say "I see it now" rather than "I'm seeing it now". On the same logic, "I hear you now" rather than "I am hearing you now". But I doubt it in practice. I want to talk freely but at the same time to be sounded natural. When should people keep the mentioned rules in practice, if any?
For example:
Imagine a teacher in a lecture who doesn't(?) hear his student while he ask him question. Should he tell him:
I am sorry, I don't hear you, so please, speak a little bit loudly.
or
I am sorry, I am not hearing you, so please, speak a little bit loudly.
Kindly, inform me if there should be a difference between formal and informal language in this case.
Best Answer
In that specific context, we'd actually say, "I can't hear you," since we know "you" are speaking. "I don't hear" may indicate that there is no sound to be heard: I don't hear anyone out there.
In general, both the simple present and the present progressive forms of sense verbs are used. Often the difference between them is only the difference you'd expect from the tenses - one (progressive) describes an ongoing event, the other (simple present) a habit, or an event that's not time-bound:
Do you see that? // Are you seeing this?
If I hear you say... // If I'm hearing you correctly...
She feels the soft grass // The kids are feeling the animals in the touch tank
The cook smells the soup // While the dog is smelling all the other dogs...
He tastes cardamom in the coffee // As the diners are eating, they're tasting all the flavors in the food