Any difference between とは思う and と思う?


When expressing a thought, can とは思う and と思う be used interchangeably, or is
there a more specific reason to choose one over the other?




If you heard about the difference between が and は, the existence of は there
plays _basically_ a similar role. (Maybe [this
question](https://japanese.stackexchange.com/q/22/45489) helps).

One of the functions/meaning of は is 取り立て, which means it indicates the
speaker 'picks up' from multiple things.

と思う is the neutral _to think that...._. Adding は indicates that there are
other things the speaker is thinking and from which the speaker 'picks up'
what they say.

For example, 彼が悪いと思う means just _I think he is to blame_. 彼が悪いとは思う basically
means the same, but implies the speaker is thinking something else too, and
sounds like more nuanced (e.g., if the issue is between him and some other
guy, _he is to blame, but there are things the other shouldn't have done and
the other is partially to blame too_ )




If you heard about the difference between が and は, the existence of は there
plays _basically_ a similar role. (Maybe [this
question](https://japanese.stackexchange.com/q/22/45489) helps).

One of the functions/meaning of は is 取り立て, which means it indicates the
speaker 'picks up' from multiple things.

と思う is the neutral _to think that...._. Adding は indicates that there are
other things the speaker is thinking and from which the speaker 'picks up'
what they say.

For example, 彼が悪いと思う means just _I think he is to blame_. 彼が悪いとは思う basically
means the same, but implies the speaker is thinking something else too, and
sounds like more nuanced (e.g., if the issue is between him and some other
guy, _he is to blame, but there are things the other shouldn't have done and
the other is partially to blame too_ )

