Asking a question with "da" and "datta"


We use "desu" and "deshita" to make the polite form and "ka" to make it a
question, for example:

[code]

    Tokyo ga suki desu ka? (Do you like Tokyo?)
    Tokyo ga suki deshita ka? (Did you like Tokyo?)
    
[/code]

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.

**P.S.2**

How common and ok to use this in informal speech (without **ka** )?:

[code]

    Tokyo ga suki da/datta?
    
[/code]

Just yes or no.




All of _desu, deshita_ , and _datta_ appear normally before _ka_.

But _da_ is an exception. In main clauses (like your examples), _da_ is
deleted before _ka_ :

[code]

     desu    + ka   →　　 desu ka
     deshita + ka   →　deshita ka
     da      + ka   →　　      ka
     datta   + ka   →　　datta ka
[/code]

In subordinate clauses (like _[dare da ka] shiranai_ ), _da_ sometimes appears
before _ka_.

* * *

Although you want a short answer, you should also consider alternate ways of
forming questions, for example using rising intonation, omitting _ka_. In
informal speech, people don't always use the textbook-style question with _ka_
at the end.




All of _desu, deshita_ , and _datta_ appear normally before _ka_.

But _da_ is an exception. In main clauses (like your examples), _da_ is
deleted before _ka_ :

[code]

     desu    + ka   →　　 desu ka
     deshita + ka   →　deshita ka
     da      + ka   →　　      ka
     datta   + ka   →　　datta ka
[/code]

In subordinate clauses (like _[dare da ka] shiranai_ ), _da_ sometimes appears
before _ka_.

* * *

Although you want a short answer, you should also consider alternate ways of
forming questions, for example using rising intonation, omitting _ka_. In
informal speech, people don't always use the textbook-style question with _ka_
at the end.

