Telling the Grammar Patterns 間 and 間に Apart

TELLING THE GRAMMAR PATTERNS 間 AND 間に APART
These are two Japanese grammar patterns that are often mixed up.
They differ by just one に, but their meanings are completely different.
Source: Tiếng Nhật Tanoshii

See also:
Telling ～たら and ～と Apart
Telling the Patterns ～に対して and ～にとって Apart