This is a Pine Tree. See how the needles are LONG?
Well, when you LONG for something, you PINE for it. So that is a good trick to remember the pine tree.
And this is a FIR tree! See how the needles are FLAT? FLAT and FIR both start with 'F'. And that is how you remember the fir tree!
And this is a Spruce tree! At first it is hard to tell it apart from the Fir tree.
But look close. The needles go all the way around the branch. They don't lie flat and smooth. See? I do not have a good trick to remember the Spruce tree--maybe you can think of one?
Can you tell what these two trees are? If you said Pine and Spruce then you are right!