Function words (articles, prepositions, auxiliaries, pronouns, conjunctions) have two pronunciation forms in English: a strong form used in isolation or under contrastive stress, and a weak form used in their normal, unstressed position in connected speech. The weak form is the default; the strong form is the exception.
| Word | Strong | Weak |
|---|---|---|
| a | /eɪ/ | /ə/ |
| the | /ðiː/ | /ðə/ |
| can | /kæn/ | /kən/ |
| have | /hæv/ | /əv/, /v/ |
| was | /wɒz/ | /wəz/ |
| for | /fɔː/ | /fə/ |
| to | /tuː/ | /tə/ |
| and | /ænd/ | /ən/, /n/ |
| of | /ɒv/ | /əv/ |
| from | /frɒm/ | /frəm/ |
English has over 40 common weak forms. Most involve vowel reduction to schwa /ə/.
Weak forms are the single biggest cause of listening comprehension failure for learners. Students learn words in their strong (dictionary) form and cannot recognise them when they encounter the weak version in natural speech. Teaching weak forms directly improves bottom-up decoding.