to me it doesnt make sense because manchmal means sometimes.. so you might want to take manchmal out of the sentence so then it means 'we have to go to that film ((movie))'
for tenses.. its really hard to explain.
so for example... gehen means 'go'
but if you want to say 'went' then you say 'gegangen'
why dont we do 5 examples-
it'll be a word first, then the tense
1- come means Kommen. Tense- came means gekommen
2- sit means Sitzen. Tense- sat means gesessen
3- talk means Rede. Tense- talked means geredet
4- sneeze means Niesen. Tense- sneezed means Geniest
5- laugh means Lachen. Tense- laughed means gelacht
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