French learners often struggle with the letter 'e' which has four distinct pronunciations: /e/ as in 'hey', /ɛ/ as in 'bet', /ə/ as in 'Tina', or it can be silent. Diacritical marks clarify pronunciation. The diaeresis (Ë) forces the open /ɛ/ sound, as seen in 'Noël' (/nɔɛl/) versus 'noel'.

The grave accent (È) marks the open /ɛ/ when it shouldn't be silent or reduced, crucial in verbs like 'j'achète'. The acute accent (É) indicates the /e/ sound, required in words like 'été' (summer) where rules might suggest otherwise. The circumflex (Ê) signals an 'e' after a lost 's', pronounced /ɛ/ as in 'forêt' (forest).

These rules are vital for sounding natural and being understood.