I don't know the answer. How many times do I have/ I do have/ I have to tell you?
do I have
15
I don't know why he's always/ why is he always/ so unhappy.
why he's always
15
Do you have any idea when the results will be published/ when the results will be published/ will the results be published?
the results will be published
20
How many people did you call/ you call/ you called for the party?
did you call
10
I wonder how long this cold weather will last/ how long will this cold weather last/ how this cold weather will last
how long this cold weather will last
20
Did she tell you how often should you take the vitamins/ you should take the vitamins/ do you take the vitamins?
you should take the vitamins
15
I'd like to know whether can I use the new product for the experiment/ if can I use the new product/ whether I can use the new product for the experiment