[§ 419]. Collectiveness as opposed to plurality.—In sentences like the meeting was large, the multitude pursue pleasure, meeting and multitude are each collective nouns; that is, although they present the idea of a single object, that object consists of a plurality of individuals. Hence, pursue is put in the plural number. To say, however, the meeting were large would sound improper. The number of the verb that shall accompany a collective noun depends upon whether the idea of the multiplicity of individuals, or that of the unity of the aggregate, shall predominate.
Sand and salt and a mass of iron is easier to bear than a man without understanding.—Let sand and salt and a mass of iron be dealt with as a series of things the aggregate of which forms a mixture, and the expression is allowable.
The king and the lords and commons forms an excellent frame of government.—Here the expression is doubtful. Substitute with for the first and, and there is no doubt as to the propriety of the singular form is.
[§ 420]. The reduction of complex forms to simple ones.—Take, for instance, the current illustration, viz., the-king-of-Saxony's army.—Here the assertion is, not that the army belongs to Saxony, but that it belongs to the king of Saxony; which words must, for the sake of taking a true view of the construction, be dealt with as a single word in the possessive case. Here two cases are dealt with as one; and a complex term is treated as a single word.
The same reason applies to phrases like the two king Williams. If we say the two kings William, we must account for the phrase by apposition.
[§ 421]. True notion of the part of speech in use.—In he is gone, the word gone must be considered as equivalent to absent; that is, as an adjective. Otherwise the expression is as incorrect as the expression she is eloped. Strong participles are adjectival oftener than weak ones: their form being common to many adjectives.
True notion of the original form.—In the phrase I must speak, the word speak is an infinitive. In the phrase I am forced to speak, the word speak is (in the present English) an infinitive also. In one case, however, it is preceded by to; whilst in the other, the particle to is absent. The reason for this lies in the original difference of form. Speak - to = the Anglo-Saxon sprécan, a simple infinitive; to speak, or speak + to = the Anglo-Saxon to sprécanne, an infinitive in the dative case.
[§ 422]. Convertibility.—In the English language, the greater part of the words may, as far as their form is concerned, be one part of speech as well as another. Thus the combinations s-a-n-th, or f-r-e-n-k, if they existed at all, might exist as either nouns or verbs, as either substantives or adjectives, as conjunctions, adverbs, or prepositions. This is not the case in the Greek languages. There, if a word be a substantive, it will probably end in -s; if an infinitive verb, in -ein, &c. The bearings of this difference between languages like the English and languages like the Greek will soon appear.
At present, it is sufficient to say that a word, originally one part of speech (e.g., a noun), may become another (e.g., a verb). This may be called the convertibility of words.