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The form in use in the first example is しないと which basically means 'unless x'. Yatte minaito wakaranai = If we don't try we won't know.
The second is しなければなりません, meaning 'have to do x'. Ikenakereba narimasen = I have to go.
The trick is understanding all the different contractions or speaking styles and narrowing it down to the root grammar structure.
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 thanks to Patchy ♥
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