We use "desu" and "deshita" to make the polite form and "ka" to make it a question, for example:
Tokyo ga suki desu ka? (Do you like Tokyo?) Tokyo ga suki deshita ka? (Did you like Tokyo?)
How can I ask the same questions using the dictionary, casual forms of "desu" and "deshita" which are "da" and "datta"?
Should I add "ka" at the end of a sentence? Or just replace "desu" and "deshita" with "da" and "datta"?
P.S. I don't need a long explanation, but rather a simple answer. The information I've found so far is ambiguous.
How common and ok to use this in informal speech (without ka)?:
Tokyo ga suki da/datta?
Just yes or no.