That is the problem with the random exercises: We do not have a chance to consult the notes before doing the tasks. As a random exercise these sentences are useless for me because I do not remember the rules and I am unable to deduce them from 20 examples. The only benefit is that now I know that I have forgotten all the rules about demonstrative pronouns, so now I can look up the concerning lesson, study the notes and redo the exercise. A link from the random exercises to the notes would save a lot of useless work.
I agree. I have printed the notes so that I can add my own reminders. But it still does not help. There is not enough explanation of the grammatical or other reasons behind the various changes. We are then left with a series of random exercises and no means of organising them into structured patterns in our own minds. The notes need to be re-written.
Acești instead of aceștia? Does this has to do with vowels? I am confused with this topic.
IIRC it's to do with whether it's placed before or after the noun. So it would be "oamenii aceștia" (I believe it has to use the definite article with the post-noun form) or "acești oameni" (and this form requires the indefinite article for the noun) and both mean "these men/people".
I am quoting from the Tips: "The form of the proximity and distance pronominal adjective that is placed before the noun is with the final "a": acest munte (this mountain), acel munte (that mountain), această casă (this house), acea casă (that house.). End quote . There is no final a on two of the examples. And, acest, acel, această, and acea are not on the charts at all. So..... what the heck?? This final a makes no sense.
I've pieced this together: It depends on if it's indefinite or definite. I think the definite is when the noun is identified as definite, usually before it as in "Femeile asta..." Indefinite (order: masc sing, fem sing, masc pl, fem pl) this: acest, această; these: acești, aceste that: acel, acea; those: acei, acele
Definite This: ăsta, asta; Those: ăștia/aceștia, astea/acestea That: ăla/acela, aia/aceea; Those: ăia/aceia, alea/acelea