Japanese phrase
私は___だと考えます。 watashi wa ___ da to kanga e ma su
Meaning
I believe ___.
When to use it
States a considered personal opinion. The polite wording fits meetings and careful discussions, and sounds more formal than everyday speech.
Example dialogue
この案は必要ですか？ ko no an wa hitsu yō de su ka
Is this plan necessary?
私は必要だと考えます。 watashi wa hitsu yō da to kanga e ma su
I believe it is necessary.