This study addresses the question of how the main factors related to input--including the environment in which children are exposed to both languages, the relative timing of the onset of the exposure to them and the amount of input--affect bilingual language acquisition at primary-school age. We examined the data of 42 German Polish bilinguals who had acquired German from birth and German monolinguals, comparing on the one hand simultaneous bilingual children speaking German as a majority language with simultaneous bilinguals who speak German as a heritage language and, on the other hand, comparing heritage speakers of German who are simultaneous bilinguals with those who are sequential bilinguals. We studied their word order patterns in German, specifically the position of verb and negation, by dint of several tasks including acceptability judgment, forced choice, sentence repetition, and narrative tasks. The results revealed the effect of all three factors on word order patterns used by bilinguals between the ages of 7 and 13. The performance of simultaneous bilingual heritage speakers varies across the tasks. We conclude that they have problems inhibiting their stronger language in tasks that place higher demands on processor, leading to a non-target-like performance in their weaker language in producing narratives.