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The German "present perfect" construction is called the Perfekt (perfect), and for most verbs is the usual past tense for colloquial speech and dialects. For details, see German verbs . Other Germanic languages have similar constructions, such as the perfekt of Swedish and the perfectum (compound past) of Dutch .
Being a verb, an infinitive may take objects and other complements and modifiers to form a verb phrase (called an infinitive phrase). Like other non-finite verb forms (like participles , converbs , gerunds and gerundives ), infinitives do not generally have an expressed subject ; thus an infinitive verb phrase also constitutes a complete non ...
Present infinitives, also called contemporaneous infinitives, occur at the time of the main verb. Perfect infinitives (prior infinitives) occur at a time before the main verb. Future infinitives (subsequent infinitives) occur at a time after the main verb. For example, the contemporaneous infinitive in this sentence, Dīxērunt eum iuvāre eam.
In Latin, most verbs have four principal parts.For example, the verb for "to carry" is given as portō – portāre – portāvī – portātum, where portō is the first-person singular present active indicative ("I carry"), portāre is the present active infinitive ("to carry"), portāvī is the first-person singular perfect active indicative ("I carried"), and portātum is the neuter supine.
There is a perfect infinitive (to) have written and a perfect progressive infinitive (to) have been writing, and corresponding present participle/gerund forms having written and having been writing. A perfect subjunctive (have written) is also sometimes used. Future and conditional perfect forms are given below.
For all uses of specific perfect constructions, see the sections below on the present perfect, past perfect, future perfect, and conditional perfect. By using non-finite forms of the auxiliary have , perfect aspect can also be marked on infinitives (as in should have left and expect to have finished working ), and on participles and gerunds (as ...
Apart from what are called the simple present (write, writes) and simple past (wrote), there are also continuous (progressive) forms (am/is/are/was/were writing), perfect forms (have/has/had written, and the perfect continuous have/has/had been writing), future forms (will write, will be writing, will have written, will have been writing), and ...
Also it is generally restricted to denoting the formation of finite forms of a verb – these may be referred to as conjugated forms, as opposed to non-finite forms, such as an infinitive, gerund, or participle which respectively comprise their own grammatical categories [citation needed].