これがその少年です。

this (indicating an item near the speaker, the action of the speaker, or the current topic); this person (usu. indicating someone in one's in-group); now; here; I (me); certainly

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

boy; juvenile; young boy; youth; lad

be; is