50. Verbs with an impersonal or indeterminate subject, as "it rains,"
"it is snowing," are called impersonal, because there is no actual
subject, the word "it" serving merely as an introductory particle. No
such particle is used with impersonal verbs in Esperanto:
Pluvas, it rains, it is raining.
Negxis hieraux, it snowed yesterday.