Ahmed carries a dictionary with him to assist with English, his second language. Though native English$-$speakers can mostly understand him, his words sometimes come out in the wrong order. What aspect of his English should Ahmed focus on to improve?

his semantic code, as he confuses multiple word meanings

his pragmatic code, as he lacks contextual awareness

his semantic code, as he struggles with writing proficiency

his syntactic code, as he fails to apply a familiar word order