Modal Verbs of Deduction: must, can't, might have
ஊகிக்கும் வினைச்சொற்கள்
These modals let you reason aloud about something you're not certain of — deducing what must be true, what can't be true, and what might have happened, all from available evidence.
Grammar Comparison
இலக்கண ஒப்பீடு
Deduction about the present vs. deduction about the past
She must be tired. (present deduction) vs. She must have been tired. (past deduction, adding have + participle)
அவளுக்கு களைப்பா இருக்கும். / அவளுக்கு களைப்பா இருந்திருக்கும். (a similar present/past split, marked with a slightly different ending)
Both languages let you reason about certainty in either the present or the past, but English marks the shift by inserting have + past participle after the modal — must be (now) becomes must have been (back then). The same layering applies to can't (impossible) and might (uncertain): can't have left, might have forgotten. Treat 'modal + have + participle' as a single grammatical unit for reasoning about the past, parallel to how Tamil's own past-tense ending shifts the same deduction backward in time.
Vocabulary
சொற்கள்
| English | Pronunciation | Tamil |
|---|---|---|
| She must be tired. | shee must bee TY-erd | அவளுக்கு களைப்பா இருக்கும்.avaḷukku kaḷaippā irukkum. |
| She must have been tired. | shee must hav been TY-erd | அவளுக்கு களைப்பா இருந்திருக்கும்.avaḷukku kaḷaippā irundhirukkum. |
| He can't have left already. | hee kant hav left awl-RED-ee | அவன் ஏற்கனவே போயிருக்க மாட்டான்.avan ēṟkaṉavē pōyirukka māṭṭān. |
| They might have forgotten. | thay myt hav for-GOT-en | அவங்க மறந்திருக்கலாம்.avanga maṟandhirukkalām. |