21. The past perfect is used when the action occurred in the past before another action in the past. 22. The past perfect progressive may also have additional specific uses similar to those of the plain past perfect ; see,,, and. 23. The past perfect progressive may also have additional specific uses similar to those of the plain past perfect; see,,, and. 24. You're using the past perfect progressive tense ( " had been going on " ) where there is no need to. 25. Note also that for past actions that occurred " before " the relevant past time frame, the past perfect is used. 26. In Vietnamese, the present perfect tense, past perfect tense are used as past tense, future perfect are used as future tense. 27. If the verb in question does not use the past perfect is used instead ( see examples in the previous section ). 28. Unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence. 29. In contrast to English and many other languages, Swedish does not use the perfect participle to form the present perfect and past perfect . 30. It mixes the " must " meaning with the present / past perfect usage, the latter of which never uses " got ".
