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Then, the present perfect continuous form is often used, if a continuing action is being described. For examples, see Uses of English verb forms § Present perfect as well as the sections of that article relating to the simple past, present perfect continuous, and other perfect forms.
The present perfect continuous (or present perfect progressive) construction combines some of this perfect progressive aspect with present tense. It is formed with the present tense of have (have or has), the past participle of be (been), and the present participle of the main verb and the ending -ing.
The present auxiliary implies that they are in some way present (alive), even when the action denoted is completed (perfect) or partially completed (progressive perfect).) Aspects of the past tense: Past simple (not progressive, not perfect): "I ate" Past progressive (progressive, not perfect): "I was eating" Past perfect (not progressive ...
Perfect progressive passives, as in the last example, therefore involve two consecutive participles of the auxiliary verb be; these constructions are rarely used. The implications of the present perfect (that something occurred prior to the present moment) are similar to those of the simple past.
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.
In the example, the progressive aspect expresses the fact that the subject is actively putting on clothes rather than merely wearing them as in the continuous aspect. This example is useful for showing English speakers the difference between continuous and progressive because "wearing" in English never conveys the progressive aspect.
A number of multi-word constructions exist to express the combinations of present tense with the basic form of the present tense is called the simple present; there are also constructions known as the present progressive (or present continuous) (e.g. am writing), the present perfect (e.g. have written), and the present perfect progressive (e.g ...
The present tense used in the condition clause may take the form of the simple present as in the above examples, or the present progressive, present perfect or present perfect progressive as appropriate (according to general principles for uses of English verb forms): If he is sleeping when we arrive, we shan't wake him. (present progressive)