Native speakers will probably disagree with me. Teachers probably teach this differently than I will explain it.
When you first were learning English, you were probably told about a list of verbs that can't take the progressive. She's loving it, etc. (By the way, I hate the McDonald's slogan.)
Then you will see native speakers DO use those verbs in the progressive in specific situations:
- It's a new situation. I'm loving my new job.
- It's a temporary situation. I'm hating the way you are acting right now!
- It's a transition from one thing to another. I'm seeing what looks like two grey blobs. Okay, now I'm seeing what looks like two people. Okay, great, it's in focus now - I can see a man and a little boy waving, both in grey sweaters.
So you will hear "What is smelling so good?" as the person sniffs in the kitchen, inquiring about dinner, or "She's loving Paris" to describe a temporary trip someone is taking.
Usually you would say "I missed you while you were gone!" but your use is okay because you help transport your listener to your temporary - but strongly felt - sensation of missing this person.
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