"I think, Doctor, that would be in bad taste."

I don't care what you think, Doctor, just get out of there.

"When do you think that will be, Doctor?"

I think, Doctor, that you're all playing games, here.

"I think, Doctor, that some things should never be forgotten."

I have begun to think, Doctor, that fate has cheated me.

I think, Doctor, that you've always been and always will be a bit of a romantic.

I don't think you will anyway, Doctor, but intelligence agencies are highly suspicious entities.

"I don't think that'll be necessary, Doctor" the captain said as he watched the helm console from where he stood.

What do you think it can have been, Doctor?'