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Need

Need is a semi-modal verb because in some ways it is like a modal verb and in other ways like a main verb.

We use need mostly in the negative form to indicate that there is no obligation or necessity to do something:

  • You needn’t take off your shoes.

Need: form​

Affirmative form​

Affirmatives with the semi-modal need are not common and they are used in formal contexts. There is almost always a negative word (e.g. no one, nobody, nothing) or phrase in the clause, even if the verb phrase is affirmative:

  • No one need think that we are doing this every week. (we are not doing this every week)
  • Nobody need know the name of the person who made the complaint.
  • Not a thing need change on this page.

Need comes first in the verb phrase (after the subject and before another verb):

  • Let’s forget about it. No one need know about it.

We can’t use another modal verb with need:

  • No one need read this.
  • Not: No one need must read this. or No one must need read this.

Negative form​

warning

We form the negative by adding not after need. Need not can be contracted to needn’t. We don’t use don’t/doesn’t/didn’t with the semi-modal verb need:

  • You need not spend a lot of money on presents. (formal) (or You needn’t spend a lot of money on presents.)
  • Not: You don’t need spend a lot of money on presents.
See also
  • Modal verbs
  • Semi-modal need and main verb need

Question form​

The question form of the semi-modal need is not very common. It is rather formal. The subject and need change position to form questions. We don’t use do/does/did.

  • Need we write this down?
  • Not: Do we need write this down?

Need: use​

No obligation (needn’t)​

The semi-modal need is most common in the negative. We use it to show that there is no obligation:

  • We needn’t spend much time on this topic. It’s not going to be in the exam.
  • Cans of soup needn’t be kept in the fridge.

No obligation in the past​

The semi-modal need has no past simple form. Instead, we use didn’t need to or didn’t have to when we express no obligation in the past:

  • I didn’t need to buy any books. They were all in the library. (main verb need + to)
  • (or I didn’t have to buy any books. They were all in the library.)
  • Not: I didn’t need buy any books. They were all in the library.
See also
  • Semi-modal need and main verb need

Unnecessary events​

We use needn’t have + -ed form to refer to events which happened but which the speaker considers were unnecessary:

  • You needn’t have waited for me. (You waited for me but it wasn’t necessary.)
  • You needn’t have bought so much food. There are only three of us staying for the weekend. (You bought a lot of food but it wasn’t necessary.)

Semi-modal need and main verb need​

We can use main verb need as an alternative to semi-modal need. Main verb need is followed by to and it changes with person, number and tense (I, you, we, they need to; she, he, it needs to; I, you, she, he, it, we, they needed to).

Compare

Semi-modal needMain verb needComment
Need it be so dark in here? (formal)Does it need to be so dark in here?In these examples, the meaning is the same for semi-modal need and main verb need + to.
You needn’t mention this to your father.You don’t need to mention this to your father.
warning

We must use the main verb need when it is followed by a noun phrase or -ing clause:

  • You don’t need [noun phrase]an umbrella.

  • Not: You needn’t an umbrella.

  • My hair doesn’t need [-ing clause]cutting for at least another month.

  • Not: My hair needn’t cutting for at least another month.

Typical error​

The main verb need is followed by to when used with another verb.

  • I need to have my hair cut.
  • Not: I need have my hair cut.