A compound subject is two or more subjects joined by and or or.
These subjects share the same predicate.
![group image](https://smrt.sfo2.cdn.digitaloceanspaces.com/core/LMLA/KIDS/ENGL125Kids/unit05/Grammar%205-5/5-5g1.jpg)
A child or an adult can ride a bicycle.
![group image](https://smrt.sfo2.cdn.digitaloceanspaces.com/core/LMLA/KIDS/ENGL125Kids/unit05/Grammar%205-5/5-5g2.jpg)
The train and bus can take me to work in the morning.
![group image](https://smrt.sfo2.cdn.digitaloceanspaces.com/core/LMLA/KIDS/ENGL125Kids/unit05/Grammar%205-5/5-5g3.jpg)
Hot dogs and hamburgers are popular barbecue foods.