Verb: the Category of Mood
The category of Mood is the most controversial category of the verb.
B.A. Ilyish: " The category of mood in the present English verb has given rise to so many discussions, and has been treated in so many different ways, that it seems hardly possible to arrive at any more less convincing and universally acceptable conclusion concerning it."
Among the scholars to be named in the first place in relation to the problem are A.I. Smirnitsky, whose theories revolutionized the presentation of English verbal grammar; then B.A. Ilyish , a linguist who made a great contribution to the general problem of mood; then Y.N. Vorontsova; Z.S. Khlebnikova.
The category of Mood expresses the relations between the action, denoted by the verb, and the actual reality from the point of view of the speaker. The speaker may treat the action/event as real, unreal or problematic or as fact that really happened, happens or will happen, or as an imaginary phenomenon.
It follows from this that the category of Mood may be presented by the opposition
obligue mood - direct mood
= unreality = reality.
The former is the strong member.
The latter is the weak member.
Mood relates the verbal action to such conditions as certainty, obligation, necessity, possibility.
The most disputable question in the category of mood is the problem of number and types of Obligue Moods. Obligue Moods denote unreal or problematic actions so they can't be modified by the category of tense proper. They denote only relative time, that is simultaneousness or priority. Due to the variety of forms it's impossible to make up regular paradigms of Obligue Moods and so classify them.
Some authors pay more attention to the plane of expression, other to the plane of content. So different authors speak of different number and types of moods. The most popular in Grammar has become the system of moods put forward By Prof. Smirnitsky. He speaks of 6 mood forms:
The Indicative Mood
The Imperative Mood
Subjunctive I
Subjunctive II
The Conditional Mood
The Suppositional Mood
Subjunctive I expresses a problematic action. Subjunctive I is used in American English and in newspaper style. Subjunctive I coincides with the Infinitive without the particle to. Ex.: Ring me up if he would be there.
This mood is expressed in English to a very minor extent (e.g.: So be it then!). It is only used in certain set expressions, which have to be learned as wholes:
Come what may, we will go ahead.
God save the Queen!
Suffice it to say that...