when "do you think" is added into a interrogative sentence, the order of the sentence must be changed to statement sentence eg. what can i do? when "do you think " added, the sentence should be what do you think I can do.
how about when I write: What do you think is the most important thing about friendship? because I can also write: what do you think the most important thing about friendship is? and that is also write. What's the difference between this sentence and "what do you think I can do"
how about when I write: What do you think is the most important thing about friendship?
-------in the above sentence, "what" is the subject, important thing is object, so its no need to change the order of the senece because I can also write: what do you think the most important thing about friendship is? --------While in this sentence, the subject is the most import