LESSON XXX.THE INTERROGATIVE ADVERB OF QUANTITY.
140. The interrogative adverb of quantity related to the interrogative pronoun kiu is kiom, how much, how many:
Kiom da tempo vi ripozis? How much time did you rest?
Kiom da sukero kaj kiom da fragoj vi aĉetis? How much sugar and how many strawberries did you buy?
Ni miras kiom da mono li havos, we wonder how much money he will have.
Kiom de la leciono vi lernis? How much of the lesson did you learn?
MODIFIERS OF IMPERSONALLY USED VERBS.
141. Any modifier of an impersonal verb (50) or of a verb used impersonally, that is, with an infinitive or clause for its subject, or without any definitely expressed or personal subject (as in "it is cold," "it seems too early"), must necessarily be adverbial:
Estas varme en la domo, it is warm in the house.
Estos malvarme morgaŭ, it will be cold tomorrow.
Estas bone ke li venis, it is well that he came.
Estas amuze ke ni forgesis lin, it is amusing that we forgot him.
Ke vi venis estis tre saĝe, that you came was very wise.
Estos pli agrable en la salono, it will be pleasanter in the parlor.
FORMATION OF CARDINAL NUMERALS.
142. The cardinal numerals for the tens, hundreds and thousands are formed by prefixing du, tri, kvar, etc., to dek, ten, cent,hundred, and mil, thousand, respectively.
Tens.
dudek, twenty.
tridek, thirty.
kvardek, forty.
kvindek, fifty.
sesdek, sixty.
sepdek, seventy.
okdek, eighty.
naŭdek, ninety.
Hundreds.
Thousands.
ducent, two hundred.
kvincent, five hundred.
sepcent, seven hundred, etc.
trimil, three thousand.
kvarmil, four thousand.
sesmil, six thousand, etc.
143. The cardinals between ten and twenty, twenty and thirty, etc., are formed by placing unu, du, tri, etc., after dek, dudek, tridek, etc. (Cf. dek unu, eleven, dek du, twelve, 136):
