Final answer:
The consonant sounds /p/ and /f/ are frequently confused by students. /p/ is a plosive sound made by completely blocking and then releasing airflow, while /f/ is a fricative sound created by partially obstructing airflow to create friction.
Step-by-step explanation:
The pair of consonant sounds that students frequently confuse are /p/ and /f/. These sounds are similar because they are both voiceless and produced by closing the lips, but they differ in terms of their manner of articulation. /p/ is a plosive sound, where the airflow is completely blocked and then released, whereas /f/ is a fricative sound, where the airflow is partially obstructed and creates a friction sound.