In the English language, a modal verb is an auxiliary verb that can be used to change the grammatical mood of a sentence. The key way to identify a modal verb is by its defectiveness (they have neither participles nor infinitives).
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In the English language, a modal verb is an auxiliary verb that can be used to change the grammatical mood of a sentence. The key way to identify a modal verb is by its defectiveness (they have neither participles nor infinitives).
The modal verbs in English are as follows, paired as present and preterite forms (where applicable):
- shall and should
- will and would
- may and might
- can and could
- must (no preterite form)
The following are not modal verbs but may be used for a similar purpose:
- ought to and had better
- used to
- dare and need (Archaic use)
- do
- going to
Although historically referring to past time, the preterite forms have come to be used in many cases with no such meaning.
Past time use of preterite forms
Preterite forms may be used when referring to situations seen from the perspective of an earlier time. For example, would is originally the past tense of will, and it can still be used in that sense. The statement "People think that we will all be driving hovercars by the year 2000", in the context of the 1960s, can be represented in the present by replacing the verbs in italics by the appropriate preterite forms: "In the 1960s, people thought we would all be driving hovercars by the year 2000." Likewise, "I can do that" may become "I could do that when I was younger, but not anymore."
Conditionals
The preterite forms can also be used in the apodosis in the conditional mood, such as in counterfactual conditionals: "If they wanted to do it, they would have done it by now." "If you bought a bus pass, you could catch as many buses as you liked without worrying about the cost of the fares." "If he were more polite, he might be better liked."
There is not always an explicit protasis ("if" clause) in this use: "Someone who likes red and hates yellow would probably prefer strawberries to bananas" means the same as "If someone who liked red and hated yellow were offered a choice of fruit, he or she would probably prefer strawberries to bananas." "I could help you with your work" gives a more tentative sense of ability to help than, say, "I can help you with your work" would. The implied protasis could, depending on the context, be along the lines of "If I wanted to".
Shall and will
Shall is used in many of the same senses as will, though not all dialects use shall productively, and those that use both shall and will generally draw a distinction (though different dialects tend to draw different distinctions). In standard, perhaps old-fashioned English, shall in the first person, singular or plural, indicates mere futurity, but in other persons shows an order, command or prophecy: "Cinderella, you shall go to the ball!" It is, therefore, impossible to make shall questions in these persons. Shall we? makes sense, shall you? does not.
