Final answer:
The word pairs 'excited' and 'nervous', 'brave' and 'fearful', and 'patient' and 'impatient' can be used to describe contrasting emotions in sentences.
Step-by-step explanation:
The word pairs 'excited' and 'nervous' express contrasting emotions. For example, a student might feel excited about the upcoming school play but also feel nervous about performing on stage.
'Brave' and 'fearful' are another pair of concept words that represent contrasting feelings. A person can feel brave when facing a challenge, but also fearful about the potential dangers.
Another pair of concept words that can be used in sentences is 'patient' and 'impatient'. For instance, waiting in a long line can make someone impatient, while calmly waiting for their turn demonstrates patience.