Is ea. - - Yes! Literally: it is it, or it is so.
ea is the only neuter pronoun. It is only used
with this verb "is" which is called an chopail.
It occurs later in this lesson with the
word má - - if before it. más ea - - if so.
Here the i of is is elided.

The negative of is ea is ní hea - - it is not so
and to ask a question (in the present and future tenses)
say an ea? - - Is it so? Is that so?