In this lesson, I will introduce how to say "I think that" in Japanese.

When you want to say what you think, you use the plain form together with とおもいます.

と is a quotation particle which works just like "that".

Affirmative:

さとうさん　は　きょう　パーティー　に　くる　とおもいます。

I think Mr. Sato will come to the party today.

Negative:

さとうさん　は　きょう　パーティー　に　こない　とおもいます。

I don't think Mr. Sato will come to the party today.

* Do not change とおもいます to とおもいません to negate the sentence just like English changes "think" to " don't think"

   Normally, we negate the quoted part to negate the sentence.

Affirmative:

きょうと　は　きれいだ　とおもいます。

I think Kyoto is beautiful.

Negative:

きょうと　は　きれいではない　とおもいます。

I don't think Kyoto is beautiful.

Affirmative:

あのひと　は　アメリカじんだ　とおもいます。

I think that person is an American.

Negative:

あのひと　は　アメリカ人ではない　とおもいます。

I don't think that person is an American.

References:

https://jlptsensei.com/learn-japanese-grammar/%E3%81%A8%E6%80%9D%E3%81%86-to-omou-meaning/

https://www.wasabi-jpn.com/japanese-grammar/quotation/

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