Present and future
Need can behave either as a modal verb or as 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 obligation or necessity, and it is followed by a bare infinitive:You needn't worry about that.
No one need be surprised at what happened.
You need only just ask.
I doubt whether I need help you.Need as a modal verb also occurs in interrogative sentences, but this use is much more formal:Need you make so much noise? - Need as a main verb is followed by a to-infinitive and expresses that something is necessary. It can be used in affirmative, negative and interrogative sentences:Do you have a minute? I need to talk to you about something.
I don't need to be told that I should lose weight.
Do you need to use the hairdryer?
If you want good results, you will need to work harder.
Past
- The past tense of the main verb need to is needed to:I needed to have my hair cut.
Why did they need to change the lock?The negative form didn't need + to-infinitive normally refers to actions which were unnecessary and were not performed:We didn't need to buy any milk. We had plenty at home. (we didn't have to buy any milk, and we didn't buy any) - Need as a modal does not have a past tense form. Needn't + perfect bare infinitive (have + past participle), however, is used for actions which were performed but were unnecessary:We needn't have bought any milk. We still have plenty at home. (we bought some milk, but it wasn't necessary)
For diagrams and quotes related to this topic, check out our e-book The Grammaring Guide to English Grammar.
No hay comentarios:
Publicar un comentario