The third is incorrect. It is not in proper question form. The first is more polite and formal than the second, but in both of them the verb should be "are", not "is".
Interested in Language
I would like to ask someone to confirm somethings.
Which one is more polite?
1. I should be grateful if you would confirm that the contract terms is still valid.
2. Please confirm the contract terms is still valid.
3. The contract terms is still valid?
Use 'are' if what it is relating to is plural. Use 'is' if what it is relating to is singular. You could use 'is' if the contract terms were singular -> contract term.
Last edited by +Technist Warp-; 13-Mar-2015 at 09:27.
Thank you for your opinion!
I would like to ask when should I use “is/are/am” and when should I use “do/does”?
For the above example, can I write like that “Do the contract terms still valid?”
1. He is funny.
2. They are naughty.
3. I am a student.
Use 'is' when the subject is singular. In the first sentence above, the subject is 'He' which is singular.
Use 'are' when the subject is plural. In the second sentence above, the subject is 'They' which is plural.
Use 'am' when the you use 'I'.
You could also surf the worldwide web for those examples you don't know of.
"Are the contract terms still valid?" work because the subject in the question is 'contract terms'. Using 'do' would be another thing.
For example: if you can recognise "The contract terms are still valid" as correct, you can change it to "Are the contract terms still valid?". These words do not change when you form a question. => "Do these words change when you form a question?" No, they don't.