だ
Auxiliary verb, copula, See である, See です, plain copula
be, is
た, だ
Auxiliary verb, だ after certain verb forms; indicates past or completed action
1. did, (have) done
indicates mild imperative
2. (please) do
よ
Particle, at sentence-end; indicates certainty, emphasis, contempt, request, warning, etc.
1. hey, you, hold on
Interjection
2. yo