"Guard this book well."

Translation: Jagalah buku ini dengan baik.

[BarefootB]

it looks quite strange: 'dengan baik'... why not simply baik? It's been used that way in many other sentences

[Hans_Se]

I think because "well" is an adverb (adverb of manner to be precise)

another example
1. Clearly : dengan jelas
2. Carefully : dengan hati-hati
3. Quickly : dengan cepat
4. Slowly : dengan lambat

[DuskyDaniel]

I believe if the adjective describes a verb, you'll have to use 'dengan'

[jade517936]

Another translation could be... look after my book well instead of guard

[vemmv]

Yes, guard implies that it's a very important book. Look after is more appropriate when it's just an ordinary book.

[Bij42379]

Whats the difference between "baik" and "bagus" other than "context"? Can some one explain the different contexts please?

[Kai660177]

menjaga buku ini dengan baik?

[Graeme984993]

Why can't jaga be used?