Only through experience of looking at pics of examples of orchids will you have a better time of figuring out what they are. Or you could take some sort of book with you that will help you out.
You could look at the way they grow. Are they growing psuedobulbs which look like they have bulbs at the base of the leaves. If so then it could be Cymbidiums. Phalenopsis grow in a monopodial manner, which means they only have one base for all their leaves. Each new leaf grows from the center of the plant. Also they have nice showy white and or silvery roots that like to grow out of the pot.
Hope this helps you ID them a little better. Dont trust the tags becuase they can be wrong. I have a Dendrobium that was labeled as a Phalaneopsis.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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