I have to think
They're both correct in the appropriate context. From your question I can't decipher context so can't really say.
yeah , i think is correct say a lot of thanks for quick response...
no it is not a correct sentence.
This is not a sentence it is a phrase and as a phrase it is correct.
The sentence, "They are going to the beach." is correct.
"I think I caught a cold." would be correct.
Yes. Think about it in a sentence. "Is he in the seat?"
first i think no then i think yes
I think so.
They're both correct in the appropriate context. From your question I can't decipher context so can't really say.
No, I think the correct way is- Is this the first time you've seen it?
"How are you" is a correct sentence.
The correct sentence is "Give the award to whomever you think is best."The pronoun "whomever" is the objective form, functioning as the object of the preposition "to".The pronoun "whoever" is the subjective form.
yeah , i think is correct say a lot of thanks for quick response...
Yes, this sentence is correct.
the dinosaurs' heads there i think.
If you put a question mark after it I think it is.