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Problems With Verbs (6): Logical Conclusions About Past Occurrences.

([My watch] [must have] [stopped] because it couldn't be two o'clock)

- (S): My watch
- (must have): must have
- (participle): stopped
-because it couldn't two o'clock

Remember that an observation in the present may serve as the basis for a conclusion about something which happened in the past. For example, ''it couldn't be two o'clock now.'' it may be concluded that ''my watch must have stopped in the past.''

Avoid using (should) or (can) instead of (must). Avoid using a verb word instead of (have) and a participle when referring to a past occurrence.

Example:

Incorrect: The streets are wet; it (should have rained).
Correct: The streets are wet; it (must have rained)

Incorrect: The light (is) out in her room; she (must go) to bed.
Correct: The light (is) out in her room; she (must have gone) to bed.

Incorrect: This pen (won't) write; it (can have run out) of ink
Correct: This pen (won't) write; it (must have run out) of ink.

Incorrect: The line was busy; someone (must be using) the telephone.
Correct: The line was busy; someone (must have been using) the telephone.

Incorrect: Hery was absent last week; he (must be) sick.
Correct: Hery was absent last week; he (must have been) sick.

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