Is it correct not to place the infinitive form ("to") after modal verbs (can, could, may, might, will, shall, should, ought to, must/ have to and would:
May: May I help you
Might I might go with you if you want to
will: Will you help me?
Shall: Shall I open the door?
Should: You should go to hospital.
Ought: You ought to be afraid of dark.
Must: Must I wear that blouse?
Would: Would you help me carry these books?
Could: Could you speak to Mark about yesterday?
There are also semi-modal verbs( to need and to dare)
Need:Need you some help or do you need some help?
Dare: Dare you challenge me or Do you dare to challenge me?
Thank you, indeed!