Subtle = chhota farak. Past guess (andaza): must have / can't have + V3. Regret: should have. Waste vs optional: needn't have / didn't have to. Present may / must / have to = 45. Hedge tone = 71. Future mix = I7.
1. Kya hai
45 = abhi / rule / shayad. Yahan = pehle kya hua ka chhota farak. Form: modal + have + V3, not must had / must have went.
| Job | Yaad rakho | Not this |
|---|---|---|
| past guess, almost sure | must have left | must left / must be left (galat form) |
| past guess, impossible | can't have been Amma | mustn't have been (45 mana, yahan nahi) |
| past obligation | had to wear a uniform | must have worn = guess, not order |
2. Pehle ka andaza
| Form | Yaad rakho | Example |
|---|---|---|
| must have + V3 | almost sure — pehle. Evidence abhi | Ravi's bag is gone. He must have left. |
| can't have + V3 | almost sure nahi hua. British English | That can't have been Amma. She was in Pune. |
| might / may / could have + V3 | shayad pehle. Sure nahi | The lights were on. She might have been at home. |
| must be / can't be | abhi ka guess = 45 | His bag is here. He must be in class. |
Passive form (55, yahan core nahi): The scooter must have been stolen. couldn't have bhi milta hai; exam aksar can't have.
3. Chhota farak
| Form | Yaad rakho | Example |
|---|---|---|
| should have / ought to have + V3 | regret / gussa — nahi kiya | You should have called before chai. |
| needn't have + V3 | kiya, magar zaroori nahi tha — waste | I needn't have brought lunch. The canteen was open. |
| didn't have to + base | zaroori nahi; aksar nahi kiya | I didn't have to bring lunch, so I left it at home. |
| could have + V3 | mauka tha, nahi liya. If-world = 54 | You could have taken the metro. The queue was short. |
| will + base (typical) | annoying aadat abhi. Future mix = I7. Purani aadat = 48 | He will leave the tap on after chai. |
If I had known, I would have called = 54, yahan nahi. perhaps / tend to claim naram = 71, yahan nahi.
4. Examples
Bold = modal form.
- Ravi's bag is gone. He must have left.
- The hall is empty. They must have gone for cricket.
- That can't have been Amma. She was in Pune on 15 May.
- Mr Khan can't have missed the train. He was on the platform.
- The lights were on. She might have been at home.
- The delay may have been due to monsoon rain.
- You should have called before chai.
- Ravi ought to have filled the form on time.
- I needn't have brought lunch. The canteen was open.
- I didn't have to wear a tie, so I left it at home.
- Yesterday students had to sit the exam at 9. (not must have)
- You could have taken an auto. The metro was packed.
- He will leave the tap on after chai. (typical, not I7)
- The scooter must have been stolen. (55 shape)
- His bag is here. He must be in class. (45 now)
5. Common mistakes
6. Practice
A. 10 MCQ
B. 5 fill-in
C. 3 sentences
Model answers neeche. Ek must have, ek should have, ek needn't have.
- must have: Ravi's bag is gone. He must have left.
- should have: You should have called before chai.
- needn't have: I needn't have brought lunch. The canteen was open.
7. Answer key
MCQ
- a) must have — past guess. must left galat form. should = regret.
- b) can't have — impossible past. mustn't have = 45 mana, yahan nahi. shouldn't = regret.
- b) should have — nahi kiya, gussa. must have = guess.
- b) had to — past rule. must have = guess. must = abhi.
- b) needn't have — kiya, waste. didn't have to aksar nahi kiya.
- a) didn't have to — nahi kiya. needn't have = brought it.
- a) have been — modal + have + V3. been / had been form toot.
- b) have — must have gone. has / had nahi.
- a) He will leave the tap on after chai. — typical. must have leave galat. used to = 48.
- c) perhaps / tend to — 71, not 72.
Fill-in
- must have — must've bhi OK.
- can't have — cannot / couldn't have bhi OK.
- should have — ought to have bhi OK.
- needn't have — need not have bhi OK.
- He must have gone.
Model sentences
- Ravi's bag is gone. He must have left.
- You should have called before chai.
- I needn't have brought lunch. The canteen was open.
Check: must/can't/might have + V3; should have regret; needn't have vs didn't have to; had to = past rule; typical will ≠ I7; would have if-world = 54; used to = 48; may/must now = 45; hedge = 71; paragraph jod = 73; can ability = 16 / 27.
