My German teacher explained this last year and I never really understood when to use "ins" and when to use "in", I know they are both two way prepositions but what's the difference?
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"Ins" is a contraction of "in das". So, whenever you have a situation where you would say "in das", then you could use "ins" instead.
Wir gehen in das Haus. = Wir gehen ins Haus.