[157]. 1. Adverbs derived from verbs are formed from the Participial Stem by means of the suffix -im; as,—

certātim, emulously (certō);
cursim, in haste (currō);
statim, immediately (stō).

2. Adverbs derived from nouns and adjectives are formed:—

a) With the suffixes -tim (-sim), -ātim; as,—

gradātim, step by step;

paulātim, gradually;

virītim, man by man.

b) With the suffix -tus; as,—

antīquitus, of old;

rādīcitus, from the roots.

c) With the suffix -ter; as,—

breviter, briefly.