"Dogs and cats are pets."
Translation:כלבים וחתולים הם חיות מחמד.
Elsbethwey, (Note, learning Hebrew as well, just ahead of you in the course):
It's a copula, it was discussed in other comments and mentioned in the tips and notes.
"Copula (אוגד) When we want to define a general feature of an object (i.e. lemons are sour), we use the copula (אוגד). The main purpose of the copula is to link the subject of a sentence with a predicate.
In simple terms, the copula is like the English verb "to be".
The copula in Hebrew uses the third person pronouns to describe objects (i.e. he/it הוא she/it היא they (m) הם they (f) הן).
Fish are tasty = דגים הם טעימים (literally - fish they (are) tasty).
This allows you to differentiate between: דגים טעימים - tasty fish and דגים הם טעימים - fish are tasty."
Elsebethwey, if you don't have the tips and notes:
How to get tips and notes: (My favourite ways are the first two):
(By the creator of the *Memrise Hebrew Duolingo vocab course I'm learning Hebrew Duolingo on Memrise! http://www.memrise.com/course/1031737/ ): organized by skill in one pdf for the whole course: https://www.docdroid.net/JnfmyEV/tipsnotesbackup.pdf
Replace your username where USERNAME is for information on your progress & the tips & notes: https://duome.eu/USERNAME/progress
The whole course tips and notes are here (and the site has one for each Duolingo language): organized by skill individually: http://duolingo.wikia.com/wiki/Hebrew
You can also get them on the duolingo.com site, they are the little lightbulbs when you click on a skill (make sure your browser is in desktop view mode so you can see the other duolingo features like discussions & timed practice (the language clubs were only on the app. Now that they are discontinued, many of us have moved to either or both the discord Hebrew servers, one is at: https://discord.io/hebrew or the Facebook Duolingo Hebrew learners Facebook page). From discussions you can search for all the discussions in this course (like this one you're reading, as well as see general duolingo discussions). If you can't see discussions on the main screen once logged into duolingo you're not in desktop view.