It corresponds to the English infinitive or gerund. An "infinitive phrase" is a verb phrase constructed with the verb in infinitive form. Sentences using modal verbs place the infinitive at the end. For example, most have no infinitive or gerund. This also includes the infinitive and present participle. Some verbs stem have contracted endings in the first infinitive. It is considered to be a kind of infinitive, or participle. The present participle, formed of the infinitive plus a -t ending, is not often used. Many uses of gerunds are thus similar to noun uses of the infinitive. Complex infinitives can be built, consisting of more than the original infinitive. There is a progressive infinitive "(to) be writing" and a progressive subjunctive "be writing". French and Catalan did the same, but tended to generalise the third conjugation infinitive instead. In the same way 'of' combines with the of the infinitive to make verbal adjectives. The future tense is in turn indicated using the auxiliary sal + "infinitive". These are formed by attaching a prefix to the simple infinitive.