In English, "Should" isn't always an obligation, but more of a suggestion sometimes. like, "You should try the pork! It's delicious!"
Does должен also mean it be a suggestion in certain scenarios?
And if должен is ALWAYS obligation-related, then what do you say to suggest something?
And Should, in English, also could be used for expectation of an event, or math problem. Like saying "Well, if I have calculated the data right, then you SHOULD have 500 dollars left, after tax", or "They say it should rain tomorrow"
So what about those? still должен, or something different?
A bit late now, but in case you're still interested, I translated as "need to", and it was accepted. I think "should"/"need to" are pretty interchangeable in English, especially if you're talking about changing bad habits. It's not something you categorically must do, but there's the sense that it's desirable.
I don't think there's any solution except paying attention to the meaning. Just like some cases in English, two different words have the same spelling: «есть», to eat, versus «есть», is.
(I'm pretty sure that «ест» without the soft sign always means "eats" or "eating", though.)
If you analyze the grammar around «есть», you should be able to tell the difference between "to eat" (infinitive) versus "is" (present tense). For example, in this sentence, «есть» is a secondary verb, after «должен», so it should be an infinitive form.
But I suspect that in most conversation, the difference in meaning will help you as much as the verb tenses. I had to stare at this one for a moment in confusion ("I should be smaller bread", what?) before it clicked (bread → eat).
Sorry. I just realized "have" is different. But есть is used when sometime has something, so it seems at first glance it should work? I think I might understand why I can't use it, but it would be great for beginners to have a better understanding of which is which other than, "context."
Должен is weird because it's a predicate adjective with only short forms.
You can see the declensions on wiktionary. https://en.m.wiktionary.org/wiki/%D0%B4%D0%BE%D0%BB%D0%B6%D0%B5%D0%BD