〜と おもいます
Say what you think — “I think ~.”
Now you'll use the plain form (Phase H). Put your idea in the plain form, add と, then おもいます. The opinion stays casual inside; おもいます keeps it polite outside.

あした あめが ふると おもいます。

“I think it will rain tomorrow.”
ぶんけい
The clause before と is in the plain form. Verbs and い-adjectives go in as-is. For な-adjectives and nouns, add だ (しずかだと / せんせいだと). 🔊 Tap any example to hear it.
Give an opinion or guess — “I think ~.” The part before と is in the plain form (Phase H). おもいます stays polite.
ひていの いけん
To say “I don't think ~”, Japanese usually makes the inside negative: use the plain negative, then とおもいます (not おもいません). 🔊 Tap any example to hear it.
A negative guess — “I think it won't ~.” The negative goes inside the quote: use the plain negative, then とおもいます.
かいわ
Someone asks what you think; answer with 〜とおもいます.

あした、てんきは どうですか。
How's the weather tomorrow?

あめが ふると おもいます。
I think it will rain.

あの レストランは どうですか。
What's that restaurant like?

ゆうめいだと おもいます。
I think it's famous.
クイズ
Choose the right plain form to go before とおもいます. Remember: no です/ます inside, and な-adj / nouns need だ.
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