Prefixes using pre-, re-, and sub-

Look at the following words:

preschool-  a special school that young children attend before elementary school

prepare-  to get ready for an event before it happens

predate-  (verb) something that happens before another thing happens  These dinosaur bones predate humans.

prevent-  to stop something before it happens

predict-  to guess something before it happens

What do they all have in common (the same)?

Answer... They all use pre-

What does the prefix pre- mean?

And finally, look at these words:

submarine-  an boat that floats under the water

subway-  a train that runs under the ground

subzero-  below freezing temperature

substitute-  a replacement (originally- something that works instead of or under something else)  Our teacher didn't come to school today so we had a substitute teacher.

What do these words have in common?

Answer... They all use sub-

What does the prefix sub- mean?