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I wish you had been a student of mine. Those are the very ideas I try to get my students to think of. I challenge my students to think of something that isn't matter. We finally get around to naming things such as energy, ideas, feelings, spirits. Our test is whether something can occupy the same space at the same time if it can then one of them can't be matter. We use the light in the room as our example. The air is not pushed out of the room simply because you turn the lights on. I ask if a burning light bulb weighs more than a darkened light bulb. Matter has mass so the addition of the light must not be matter. Unfortunately your teacher did what many teachers do when they don't know how to respond. Sorry.
Materials exist as solids, liquids and gases, and as a mixture of these states. They may be natural or man made and they have different textures and properties.
I see time as an idea, rather than a material, and as the teacher that is how I would have explained it. Things made of matter can be qualified as solids, liquids, or gases, but not everything we can mention can be classified as a solid, liquid, or gas, so if that is what she said, she was in error. What about peace, loneliness, fear, etc.? Some things are ideas, or feelings, or philosophies.
I hope this helps.
Time is not a physical object. time is a noun though. remember that a noun is any concrete person, place, thing, or abstract idea? time is an abstract object because it isn't tangible. since time isn't concrete it cannot be classified as having matter. so time cannot be a solid, liquid, gas, or plasma.
Time is like a teacher. It teaches us to do things constructively becuase it not infinite to us.
I too had teachers who told me odd things, and to this day I dont know where he was coming from. My HS bio teacher told us that humans were the third most intelligent species. dolphins second and memes first. BAH messed me up for a long time. people thought i was nuts asking what a meme is.
Anyways as far as states of matter goes there are now two more to add. plasma and perhaps even the bose-einstein condensate.
Time was an excellent answer, and your teacher should have recognized it. abstract concept, not a function of matter. In fact it might not even exist... fundamental part of the universe, or human conciousness construct?
Heres some other things that do not exist as solid liquid or gasses
lightning
solar wind
light
magnetism
electrons
gravity
good luck
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