Лекции по теоретической грамматике английского языка. Тивьяева И.В. - 47 стр.

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Subjunctive I and Suppositional are on the periphery of the system. The
former is a remnant of history. It has fallen out of the system and is used in
restricted contexts, such as religious hymns, slogans, etc. The latter is a new
formation that has not entered into the system yet. It is used in specific syntactic
structures, eg., after verbs ‘demand’, ‘suggest’, etc. Another indication that
Subjunctive I and Suppositional are on the periphery of the system is that they are
synonymous and interchangeable in the structure.
To sum up, the category of mood is represented by two oppositions: the
indicative mood and the spective mood. The indicative mood is the basic mood of
the verb. Morphologically it is the most developed system. Semantically, it is a fact
mood; it is the least subjective of all the moods. The spective mood, which
includes the traditional imperative and the subjunctive mood, represents a process
as a non-fact, i.e. as something imaginary, desirable, problematic, contrary to
reality. The imperative variety of the spective mood is morphologically the least
developed mood: it is only expressed by the bare infinitive form.
3. Mood and Modality
A distinction should be made between grammatical mood and semantic
modality. Mood is a matter of grammatical form, modality a matter of meaning.
The main markers of modality in English are the modal auxiliaries can, may, must,
will, shall, together with a few less central ones.
When considering modality it is useful to distinguish between two parts:
the dictum: what is said
the modus: how it is said (that is, the speaker's cognitive, emotive, and/or
volitive attitude about what is said)
For example, a sentence could have the following dictum: It is hot outside.
This dictum could be paired with various of modi, such as the following:
I hope that
it is hot outside.
I doubt that
it is hot outside.
It must
be hot outside.