Logical Conclusions -> in the Past Events

Pattern

Logical Conclusions – in the Past Events
Important: must is a modal. Must followed by the verb word have and a participle expresses a logical conclusions based of evidence. The conclution is about an event that happened in the past.
Remember that an observation in the present may serve as the basis for an conclution about something that happened in the past.

S + must have + participle + past time

For example, “here is a message on My desk (last night) .” It may be concluded that “His friend must have called last night.” (To convince)

Example: My friend must have called last night
Avoid using should or can instead of must. Avoid using a verb word instead of have and participle when referring to events in the past.
Other Examples
Incorrect : His pen won’t write, it can have run out of ink (in the past)
Correct : His pen won’t write, it must have run out of ink (in the past)
Incorrect : The ring that She was looking at is gone, someone else must buy it.
Correct : The ring that She was looking at is gone, someone else must have bought it.
Incorrect : The Sudirman streets are wet, it should have rained last night.
Correct : The Sudirman streets are wet, it must have rained last night.
Incorrect : She doesn’t have his keys, she must locked in the house.
Correct : She doesn’t have his keys, she must have locked in the house.
Incorrect : I don’t see Reny anywhere, she must be left early.
Correct : I don’t see Reny anywhere, she must have left early.

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See also; Modal, Tenses, and the Characteristic of Tenses

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