Looking on the internet deeply has found these results:

He forgot his book is the most popular phrase on the web.

He forgot his book somewhere 11 results on the web	He forgot his book 1225 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
May 15, 2002 ... in room E21 (1), because he forgot his book somewhere and wants to check whether the book is in the room E21 or not. After society E21.	... the act of moving hurriedly and in a careless manner haste the act of moving hurriedly and in a careless manner; "in his haste to leave he forgot his book". RUSH, noun. The act of moving hurriedly and in a careless manner; "in his haste to leave he forgot his book". RUSH, noun. A sudden forceful flow. RUSH, noun. Oct 21, 2015 ... I told my gorgeous yet cranky son that he could tell the scary librarian that he forgot his book even after I warned him twice. Sadly both my son ... “in his haste to leave he forgot his book”. Synonyms: hurry, rush, rushing. Types: bolt, dash. the act of moving with great haste. scamper, scramble, scurry.

He forgot his book somewhere

11 results on the web

He forgot his book

1225 results on the web

More popular!

May 15, 2002 ... in room E21 (1), because he forgot his book somewhere and wants to check whether the book is in the room E21 or not. After society E21.

... the act of moving hurriedly and in a careless manner haste
the act of moving hurriedly and in a careless manner; "in his haste to leave he forgot his book".
RUSH, noun. The act of moving hurriedly and in a careless manner; "in his haste to leave he forgot his book". RUSH, noun. A sudden forceful flow. RUSH, noun.
Oct 21, 2015 ... I told my gorgeous yet cranky son that he could tell the scary librarian that he forgot his book even after I warned him twice. Sadly both my son ...
“in his haste to leave he forgot his book”. Synonyms: hurry, rush, rushing. Types: bolt, dash. the act of moving with great haste. scamper, scramble, scurry.