1. Formation of the modal conjugations
All of the modal verbs are used as auxiliaries, and all of them form conjugations in the same way.Thus, the other modal auxiliaries form conjugations in the same way as will and would. For instance, the conjugation of the modal auxiliary could with the verb to work is formed as follows:
Conjugations of the modal auxiliary Could with the verb To Work
Simple Continuous
I could work I could be working
you could work you could be working
he could work he could be working
she could work she could be working
it could work it could be working
we could work we could be working
they could work they could be working
Perfect Perfect Continuous
I could have worked I could have been working
you could have worked you could have been working
he could have worked he could have been working
she could have worked she could have been working
it could have worked it could have been working
we could have worked we could have been working
they could have worked they could have been working
The formation of conjugations using the modal auxiliaries can be summarized as follows
Conjugation Auxiliary Verb Form
Simple modal auxiliary bare infinitive
Continuous modal auxiliary + be present participle
Perfect modal auxiliary + have past participle
Perfect Continuous modal auxiliary + have been present participle
Verbs in the Simple conjugation with a modal auxiliary generally refer to present or future time; whereas verbs in the Perfect conjugation with a modal auxiliary generally refer to past time.Verbs in the Continuous conjugation with a modal auxiliary generally refer to continuous, ongoing actions in present or future time; whereas verbs in the Perfect Continuous conjugation with a modal auxiliary generally refer to continuous, ongoing actions in past time.
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