They're both correct in the appropriate context. From your question I can't decipher context so can't really say.
That is the correct spelling of "thinking."
I have to think
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Both are correct.
I think that it is always correct.
"What do you think" is correct.
That is the correct spelling of "thinking."
I have to think
Yes this is correct.
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
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Both are correct.
Depends on what you think
"I think I caught a cold." would be correct.
The academic term in this sentence is "mood," which refers to the way a writer's verbs convey the attitude or emotion of the sentence.
The correct spelling I think would be: "Tamagotchi,"
I think that it is always correct.