(i) John is writing a book (ii) John has written a book (iii) This book was been written by John
These forms are mostly used as periphrasis forms for tense-aspect and voice periphrases.
(iv) Cettes lettres ont été écrites par Marie Those letters[Pl,F] have been written[Pl,F] by Marie
- Spencer, A. 1991. Morphological Theory, Blackwell, Oxford.
- German Partizip