This is an interogative sentence in which can/could/is/are is used in first so we will use whether/if instead of any conjunction.
Note :-If Wh question is used then no conjunction in used and auxiliary verb ( helping verb ) and subject like I , we , your , you will interchange their place.
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Answer:
I asked if that was your new dress.
I ᴀsᴋᴇᴅ ᴡʜᴇᴛʜᴇʀ ᴛʜᴀᴛ ᴡᴀs ʜᴇʀ/ʜɪs ɴᴇᴡ ᴅʀᴇss.
This is an interogative sentence in which can/could/is/are is used in first so we will use whether/if instead of any conjunction.
Note :- If Wh question is used then no conjunction in used and auxiliary verb ( helping verb ) and subject like I , we , your , you will interchange their place.
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