Distinguishing the different "I must"

So I am referring to the different ways to say, “I must”, like ~ないといけない、~なければいけない, etc.

How do you guy figure out which one is the correct one for the answer? There are four different ways to combine the first and second halves, and it is a bit annoying to have to type out three nearly identical answers before getting the correct one when they are mean more or less the same and often the question giving no real clue of which one it is looking for?

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You just remember them in alphabet order and type them one by one until correct. God bless you when it comes to more “must do” from N2 and N1, there are a LOT more!

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I removed them from my Reviews because of that.

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I just type them in until I get the right one as well. There are often subtle differences in similar grammar points, but it’s hard to know a lot of times based on the sentence in question which it will be because it could theoretically be more than one (just with different nuances at the end of the day).