In General American and Received Pronunciation, unstressed can takes the weak form /kən/, you reduces to /jə/, and the stress lands on the last syllable of pronounce: /kən jə prəˈnaʊns/. Emphasized can alone takes /kæn/.
Open barely for /kən/.
Glide into /jə/, one breath group.
Drop your jaw slightly for the final vowel.
How your mouth makes the sounds
/kən jə prəˈnaʊns/ in General American and Received Pronunciation. Stress falls on -nounce; can and you stay short and unstressed.
Shrink can: let the vowel be a quick, unstressed schwa, /kən/, like the first vowel in about. Weak forms use short reduced vowels and no stress.
Link can to you in one breath group: finish with your tongue on the ridge for /n/, then glide straight into /jə/ with no pause.
Self-check: say /kən/ then /kæn/ back to back. Copy the shorter, quicker one and let your jaw barely open for the reduced vowel.
The phrase in speech, with a contrast
/kən jə prəˈnaʊns/ in General American and Received Pronunciation. Stress lands on -nounce; can and you stay short and unstressed.
Weak form: /kən/. Strong form: /kæn/, with the full vowel of cat, used only when can is emphasized, contrasted, or stands alone.
Contrast them side by side. Weak: Can you pronounce this word? with /kən jə/. Strong, for emphasis or contrast only: Yes, I CAN.
In natural speech, function words like can almost always carry reduced vowels. Only a stressed, contrastive can breaks that pattern.
Try the phrase in a question: Can you pronounce this word? Keep can short and soft as /kən/, and finish firmly on pronounce so the stress pattern stays clear.