Some websites say
Sometimes, speakers use the Present Continuous to indicate that something will or will not happen in the near future. Examples: I am meeting some friends after work. I am not going to the party tonight. Is he visiting his parents next weekend? Isn't he coming with us tonight?
The present continuous is used to talk about arrangements for events at a time later than now. There is a suggestion that more than one person is aware of the event, and that some preparation has already happened. e.g. I'm meeting Jim at the airport = Jim and I have discussed this. I am leaving tomorrow. = I've already bought my train ticket. We're having a staff meeting next Monday = all members of staff have been told about it.
I think the second one makes more senses.
But my question is that:
Is present continuous tense only used for future arrangements? & If there is no future arrangement then we can not use present continuous tense right?
See this example,
"I am seeing my mom this afternoon" could mean "My mom & I have agreed to meet each other before"
"I am going to see my mom this afternoon" could mean "I've got a plan to see my mom, but my mom may not know it she & I have not arranged a meeting yet"
"I will see my mom this afternoon": "Will" in this case expresses a Voluntary Action. I'm willing to see my mom.
"I am going to the beach this afternoon" could mean I agreed with myself that I am going to go to the beach this afternoon & I prepared stuffs (swimming suits, sun scream, etc) for that.