Modal verbs

Deduction and speculation

We use might (not) + infinitive to say that something now or in the future is possible.

We use must, might or can't + infinitive to speculate about situations in the present.

We can also use might + infinitive to say that a future situation or action is possible.

We can use must, might or can't + be + verb + -ing to speculate about activities in progress in the present and about temporary situations in the present.

Use must, might or can't + have + past participle to speculate about the past.