Example 76 is actually one of a without go. The go here is the verb of motion go and could have read mi a kom skuul tumara 'I will come to school'. In addition, a can function as a habitual marker as mi a kom ya evriidee 'I come here everyday'.
In the case of Example 19, the verb ge(t) meaning 'there are/the existential', is a stative verb. The use of /a/ with a stative verb in Creolese signals the habitual. /doz/ or /das/ can function in the same context, with the same habitual meaning.
Source: Rickford 1987: 131 (line 253-4)
Source: Rickford 1987: 146 (line 338)