[General] Beginning, begins

[Vking]

In the word game I spy, one would say : I spy with my little eyes something beginning with ...... Would it be correct in grammatical sense if I say : I spy with my little eyes something begins with...?

Please show me the difference!

Thank you!

 

[Rover_KE]

No, it wouldn't be grammatical.

You could say 'I spy with my little eye (not 'eyes') something that begins with ...', but millions of children in the English-speaking world would soon put you right.

Rover

 

[Vking]

Thanks for that Rover!
By the way, 'eyes' was just a typo ( it's just how my mind works; when I think of eye, it's always in a pair).

What I really want to know is, say if I was to explain the sentence structure to someone by breaking it down step by step, how should I go about doing it?

Also why is it necessary to have the relative pronoun 'that' in the case when I use 'begins'.