When do I use is or does when I ask a question? For example,
- Is your item still for sale?
- Does your item still for sale?
I am not sure which one to use.
Learn English – When to use “is” vs. “does” when asking a question
auxiliary-verbsdo-supportinversionquestions
Related Solutions
Please go through this picture. I think you will understand.
Does... know is grammatically correct, but Does... can write is not. One way this could be corrected is by changing the subordinate clause to independent:
Does anyone know any examples that use this function, or can anyone write a simple example oneself?
It could also be rewritten as:
Can anyone provide an example of the use of this function or write a simple one?
This keeps verb usage in parallel; i.e. Can... provide and Can... write.
Best Answer
When the verb in a statement is neither a primary auxiliary verb (be, have, do) nor a modal auxiliary verb (will, would, can, could, may, might, shall, should, must, ought to, used to), do is used to form a question from it. Thus, ‘You know where my house is’ becomes ‘Do you know where my house is?’
Meanwhile, when the verb in a statement is a primary auxiliary verb or a modal auxiliary verb, then a question is formed from it by placing the verb before the subject. That means that ‘Your item is still for sale’ becomes ‘Is your item still for sale?’