The human brain stores words as a network, not a list. Taught on its own, big just hangs there with nothing to hold on to. Taught alongside small, it has an anchor: think of one and the other turns up by itself. That's why opposites give you more back per minute of teaching than any other group of adjectives.
The First Twelve Pairs, Ordered by How Often Children Need Them
- Size and shape: big and small, long and short, tall and short. Point out that short does double duty in two pairs, and the children who spot it will feel very clever.
- How the body feels: hot and cold, hungry and full, clean and dirty.
- Feelings and qualities: happy and sad, fast and slow, new and old, open and closed, day and night, up and down.
The Game for This Topic: Say the Word, Do the Opposite
Say a word and make a gesture with it. The class has to answer with the opposite word and the opposite gesture. You crouch down small and say "small", they fling their arms wide and shout "BIG!" Speed it up until it becomes a game of catching each other out. At this age, a moving body is the best memory glue you have.
Then make it real: point at two things in the room and let the class compare them. The board is big. The book is small. Finish on a worksheet that matches opposites with a drawn line and asks children to pick the right word for a sentence under a picture. A class that has been through this topic carries a stock of describing words into every topic that follows.