Primary sentence This is applicable for all account
Which question form is correct and why?
A) Is this applicable for all account?
B) Does this applicable for all account ?
Primary sentence This is applicable for all account
Which question form is correct and why?
A) Is this applicable for all account?
B) Does this applicable for all account ?
If there is an auxiliary verb, you always invert:
The same happens with the verb "to be" even when it's not apparently auxiliary (although some linguists consider "to be" an auxiliary in this case too, partly for this reason):
The same happens with "have got" and optionally with "have":
For all other verbs, we add the dummy auxiliary verb "do" prior to inversion. (You might say that we add it at the same time as inverting, but I prefer to think of it as a two-step process.)
In short, the sentence "This is applicable" uses the verb "to be" and therefore you don't add the dummy verb "do" and you just invert:
None are correct -- including your primary sentence.
Correct: