Having VS have
1-
I am having = I am actively engaged in doing something.
I have = I am in a state of being related to the possession of something.
Some examples that seem to fit:
I am having trouble = I am actively attempting to do something but encountering difficulties.
I am having fun = I am probably actively behaving like an idiot and my wife is looking at me strangely.
.........
2-Having: describes a behavior or action, e.g., having lunch, having a heart attack.
3-Have: describes a state of being or generality, e.g., have a headache, have a car, have a cold
Then, for fun, we can examine “will have,” which seems to work for both purposes. Tomorrow, I will have a headache, and I will have lunch at home. (Hmmm. Now that I think about this a bit more, perhaps “will have lunch” should be “will be having lunch,” which is consistent with the ideas above.)
I am having fun with this topic (action). I always have fun when discussing language (generality) ...............
3-
1.I have a car. (possession. I own a car. The car is mine.)
2.I am having dinner, (eating. I am eating dinner.)
3.He was standing and having a smoke. (smoking. He was smoking a cigar/cigarette.)
The verb have is not used in the continuous forms, when it means "possess" or "experience a condition"
I have a car
X I am having a car.
I have a cold.
X I am having a cold.
The verb have is used in continuous forms when it expresses an activity:
I have lunch at noon. (have = eat)
I am having lunch now.
He was having a smoke. (have a smoke = smoke)
The little girl had a fit when her mother took her doll away.. (to cry, scream, and behave badly)
She was having a fit.
.........
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