はず

クレイさんはアメリカ人だから、英語が分かるはずです。
kurei san wa amerika jin dakara, eigo ga wakaru hazu desu.
Clay-mr.-American-therefore-English-(subject marker)-understand-should-is
Since Clay is an American, he should understand English.

この山の中に一億円が隠してあるはずです。
kono yama no naka ni ichi oku en ga kakushite aru hazu desu.
this-mountain-'s-middle-in-one-billion (hundred million)-yen-(subject)-hidden-there is-should be
That mountain is supposed to have a billion Yen hidden inside.

The statement may or may not be true, but it is expected to be true.

Construction:
Verbs: Plain form of verb + はず
2) Nouns: Noun + の + はず