The small street is there. The s is then not pronounced. The apple is here. The bird is there. The article prefixes a t to a masculine noun beginning with a vowel.
Youth is good.
An Irishman is not normally lazy. The article is used when speaking in a general way. The house is nice but the door is bad. I am well but my foot is sore. Where there is no doubt about what or who the possesor is, the article can be used.