Breakdown:

• 아이는: the child
• 아이는 … 을 것이에요: the child will.
• 아이는 … 지 않을 것이에요: the child will not.
• 아이는 … 잡지 않을 것이에요: the child will not catch.
• 아이는 그것을 잡지 않을 것이에요: the child will not catch that.

Why not "grab"?

"the child will not catch it " thy this word is wrong word?

Is to catch 잡다? I forgot that one. I thought it was saying something about a magazine

@kevin li: Thanks a million for all your explanations! They really help a lot!!

Isn't grab also 잡다

Now "ai" is "child", but in the same lesson was accepted only as "baby"...