‘A guest is coming’ should also be accepted. I have reported this.
You are right!
a guest is coming is the correct way
And "the guest comes" - why is this wrong?
"the guest comes" is accepted as an answer (15-May-2018)
How do you differentiate between "a" and "the?"
In Swahili there is no separate particle, so no distinction between the definite article (the) and the indefinite article (a) .