Pre-
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)?
What does the prefix pre- mean?
Re-
Now look at these words:
review- look again
redo- do again
reinvent- invent again
revisit- visit again
What do these words have in common?
What does the prefix re- mean?
Sub-
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?
What does the prefix sub- mean?