One more common way to express obligation, necessity or a lack of obligation is with the semi-modal ‘need’. A semi-modal is a word that acts like both a modal verb and a main verb.
As a modal verb, ‘need’ is most typically used in negative sentences or in affirmative sentences with a negative meaning. It expresses absence of necessity or obligation, and it is followed by a bare infinitive:
‘Need’ as a modal verb also occurs in interrogative sentences, but this use is much more formal:
If used in statements, ‘need to’ is often used in the same context as ‘have to’ meaning necessity, but many times, ‘need to’ is used to express something that is less urgent, something in which you have a choice:
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:
‘Need’ as a main verb expresses that something is necessary. We can use it in affirmative, negative and interrogative sentences.
Compare:
Semi-modal need | Main verb need |
Need it be so dark in here? (formal) | Does it need to be so dark in here? |
You needn’t mention this to your father. | You don’t need to mention this to your father. |
In these examples, the meaning is the same for semi-modal need and main verb need + to.
To summarize:
The past tense of the main verb ‘need to’ is ‘needed to‘:
In the simple past negative form, we use ‘didn’t’ with ‘need’ to denote no obligation in the past.
‘Need’ as a modal does not have a past tense form. ‘Needn’t + perfect bare infinitive’ (have + past participle), however, denote actions which were performed but were unnecessary:
The future tense of the main verb ‘need to’ is ‘will need to‘:
will need to + infinitive
‘Need’ can also be used with the passive voice. We use it to refer to tasks that the speaker is probably not going to do personally or when it is not important to know who is going to complete the action.
Note: The negative form uses ‘do/does/did’. |
We can use a gerund with ‘need’. This structure is used in the same way as above. In this case, the gerund carries a passive meaning. Usually, the situations involve fixing or improving things:
Note that the structures with to-infinitive and gerund are completely interchangeable.
This video from OnScreen Academy explains the usage of the verb ‘need’ in different tenses and meanings:
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