Why did she cry? Can you tell me...
why she cried.
How long has she known him? I'd like to know...
how long she has known him.
Where were the boxes? Can you remember...
where the boxes were.
Is this the right train? Do you have any idea...
if this is / whether this is the right train.
Could you babysit tonight? I was wondering...
if you could babysit tonight.
Where is Joe? Do you know...
where Joe is.
What did he want? Would you mind telling me...
what he wanted.
Whose car was it? Could you let me know...
whose car it was.
Does she speak Greek? I'd like to know...
if she speaks / whether she speaks Greek.
Will they be all right? I wonder...
if they will be / whether they will be all right.