Student or Learner
Why did we leave out "to" in this sentence?
Boys are always go /to/ home early.
Is it correct?
I will go to shopping.
Is there any grammar rule for such sentences?
"To go home" is the commonly-used phrase when meaning "To go to the house/flat/apartment/caravan where one lives for the majority of the time or at the present time".
With your second example, for an activity such as "shopping", the word is used on its own.
I will go shopping.
I will go swimming.
I will go skiing.
I will go skydiving.
I will go hang-gliding.
If it is followed by a noun, then you need "to".
I will go to the shops.
I will go to the swimming pool.
I will go to the ski resort in France.
I will go to school.
I will go to London.