Words like separate, graduate and estimate have two lives. As a verb the ending is a full /eɪt/ (rhymes with 'late'). As a noun or adjective the ending collapses to a weak /ət/ (sounds like 'it' or 'uht').
The Rule: Verb -ate = /eɪt/ (strong). Noun / adjective -ate = /ət/ (weak). The spelling never changes; only the final vowel does.
Verbs: full /eɪt/
Nouns & adjectives: weak /ət/
More: deliberate, moderate, duplicate, advocate, associate, appropriate, alternate - all two-faced.
Why Does This Happen?
The verb keeps a clear, stressed action ending, while the noun/adjective lets that syllable relax into schwa. Listen for it: 'I will gradu-ATE' but 'a gradu-it'. The grammar lives in the vowel.
Quick Summary
| Word | Verb /eɪt/ | Noun/Adj /ət/ |
|---|---|---|
| separate | /ˈsɛpəreɪt/ | /ˈsɛprət/ |
| graduate | /ˈɡrædʒueɪt/ | /ˈɡrædʒuət/ |
| estimate | /ˈɛstɪmeɪt/ | /ˈɛstɪmət/ |
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