The boy writes on the black board просклонять предложение в разных временах по английски.

Past simple:

the boy wrote on the black board.

past continuous:

the boy was writing on the black board.

past perfect:

the boy had written on the black board.

present continuos:

the boy is writing on the black board.

present perfect:

the boy has writtwn on the black board.

future simple:

the boy will write on the black board.

future continuos:

the boy will be writing on the black board.

future perfect:

the boy will have written on the black board.

вроде всё ...