Are sentences correct?

[Kohyoongliat]

He dares not go.
He dare not go.
He needs not go.
He need not go.

Which are the correct sentences?

Thanks.

[Masme]

• Sentences 2 and 4 are correct. ‘Dare’ and ‘Need’ are used as modals.
• Sentences 1 and 3 should be recast as ‘He doesn’t dare to go’ and ‘He doesn’t need to go’, since ‘dare and need’ are used in these as ordinary verbs.

[Masme]

Thank you, Lawrence. Yet, I do wonder why I have to keep on answering the same question all over again. Nonetheless, repetition does have a pedagogical value, don’t you think? @Anglophile

@Masme

It’s the same as: ‘He doesn’t have/ need to go to school today’. Note that ‘mustn’t’ is not used in this sense.
Also, I would prefer: ‘He need not go to school today.’ When ‘need’ is used as an ordinary verb then the third person singular is followed by -s. E.g.: ‘All he needs is a little bit of rest and he’ll be alright in the morning’. In the original sentence ‘need’ should have the same present tense forms as modal auxiliary verbs. This means that the third person singular is not followed by -s. So, it should be ‘need’.

By the way, you can also say: ‘All he needs is a little rest and he’ll be right as rain in the morning.’

[Torsten]

By the way, the questions “Are sentences correct” sounds rather strange. Better:
Are these sentendes correct?
Are the following sentences correct?

[Masme]

I agree completely.