verb
1
BAD : People find it difficult to understand about the Japanese.
GOOD : People find it difficult to understand the Japanese.
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understand sb/sth (WITHOUT about ): 'After twenty years of marriage, we still don't understand each other.'
2
BAD : You have to know our culture in order to understand us deeply.
GOOD : You have to know our culture in order to understand us properly.
GOOD : You have to know our culture in order to really understand us.
BAD : Reading helps us to understand the world more deeply.
GOOD : Reading helps us to understand the world better.
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understand sb/sth properly/better; fully/really understand sb/sth (NOT deeply ): 'Make sure that you understand the instructions properly before you begin.' 'Nobody fully understands how the drug actually works.'
Note the alternative: 'Reading helps us to develop our understanding of the world.'
3
BAD : At first I wasn't understanding anything.
GOOD : At first I didn't understand anything.