NOTE (taken from the Hugon-Moore Ido Grammar); The word that is very often omitted in English, but should never be omitted in Ido; (1) The book I gave you (= the book that (or which) I gave you), La libro quan me donis a vu (in this case “that” is a pronoun: (2) I think he will come, (= I think that he will come); Me opinionas, ke il venos. (In this case “that” is a conjunction). It is generally omitted in English after verbs like tothink, tohope, towish, tobelieve. It is impossible to pay too much attention to this rule, as the correct use of the word ke is the key to a good international style for English-speaking students).
