plz tell me how do we form the tag question for the following:
1- Peter has to clean his room, .......................?
is there only one answer or more......thank you very much.
In questions and negatives both the ordinary pattern and auxiliary pattern are accepted. Same with dare, need, used to, ?
Otherwise the ordinary pattern applies.
I live and re-learn.
He has to clean the room.
Does he have to clean the room?
He doesn't have to clean the room, does he?
He has to clean the room, doesn't he?
'Have' won't need an auxiliary only when used as part of a perfect tense-form.
He has done the task, hasn't he?
Why do you call it semi-modal? Because it has a paradygm of finite forms?
With 'need' it's different.
You needn't do it, need you?
You don't need to do it, do you?
The defective form can't be used in positive sentences and it is followed by a bare infinitive. The regular form is used in all kinds of sentences and is followed by a full infinitive.
You can't say 'I need go there', you'll use the regular form: 'I need to go there'.
The defective form can be followed by a perfect infinitive, while the regular form cannot: You needn't have gone there'. You won't say 'You didn't need to have gone there'.
There are other distinctions.
But 'have to' has only one form, which is not defective and which requires an auxiliary to build up negatives and questions.