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Ought to, need, and dare, and how their behaviour differs from core modals.
Why you specifically
The rule
Semi-modals are verb forms that behave partly like modal verbs but do not follow the full modal pattern. Ought to usually expresses advice or duty and is followed by the base form; need can act like a semi-modal in questions and negatives, especially in formal English; dare can also behave this way, especially in negative statements and set patterns. In normal affirmative statements, need usually takes to + base verb.
The trap
You ought to apologize for being late.
You ought to apologize for being late.
Ought to is followed by the base form of the verb, not by to plus an -ing form or a past-tense form.
You need finish this report today.
You need to finish this report today.
Need as a semi-modal takes to + base verb in affirmative statements.
He dares not speak in the meeting.
He dare not speak in the meeting.
In formal or literary use, dare can behave like a semi-modal in negative statements without does/doing forms.
Do you need leave so early?
Need you leave so early?
As a semi-modal in questions, need can appear without do-support, especially in formal English.
Prove it
10 drills
You have not fought this one yet.
