Page 595 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

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given situation already existed.The similar contrast that is found in basic
grammar is - hd ga ii as in (2).
(2) -$c {47< /E9kl %@WL
(You should /had better go there right away.)
2. In terms of the choice of particles there are three patterns for the N
(da / dearu) to sum structure: that is, N1 {ga / o / wa} NZ (da / deam)
to sum.

The most basic one is the ga-version, i.e., (3b) and it means 'Let's
assume that (not something else but) the temperature is constant.' In the
o-version, i.e., (3c), the original subject of (3b) has been changed to a
direct object o. The o-version translates into English as 'Let's assume
the temperature to be constant' in which the original subject has
changed to the direct object, just as in the Japanese version. In (3a) 'the
temperature' is presented as the topic of the sentence. The similar parti-
cle choice is observed in the omou construction.

(As for the movie, I believe that it is interesting.)

(I believe that (not something else but) the movie is inter-
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esting.) -
=TE -
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c. QO@meEtBb>k,R5
(I believe the movie to be interesting.)
Note also that in (3) the copula da can be dropped in (3a) and (3c), but
not in (3b).
I. Compare N to sum in [la] and [2a] and N ni sum in [lb] and [2b].