When do you use "tengo" in spanish and i'd also like an example of it in a sentence.

Choose the best spanish equivalent to the phrase. they know the old salesman. conocen al vendedor viejo. saben al vendedor viejo.

What was the name of the barrio in which the poor lady lived?

Can you me conjugate this sentence of doubt using the subjunctive mood? “mis padres dudan que yo (hacer) toda mi tarea cada noche.”