End face mechanical seal - Seal categories. 1  All mechanical seals must contain the four elements described above but the way those functional elements are arranged may be quite varied. 2  Mechanical seals are generally classified into two main categories: Pusher or Non-Pusher.
User: Which verb form is used to indicate present perfect tense? verb or verb-s will verb have verb-ed have verb-ingWeegy: The verb form is used to indicate the perfect progressive tense is: have + been + verb + -ing weegy2x|Points 179|User: Which statement about a letter of complaint is true?
What are some alternative words for perfect tense? Synonyms for perfect tense This thesaurus page is about all possible synonyms, equivalent, same meaning and similar words for the term perfect tense. Princeton's WordNet (0.00 / 0 votes) Rate these synonyms: perfective, perfective tense, perfect, perfect tense (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) Synonyms: perfective aspect, perfective, perfect, perfect tense, perfective tense