Should is a ‘modal auxiliary verb’. It has no -s in the third person singular.
- He should be here soon. (NOT He shouids . . .)
Questions and negatives are made without do.
Should we tell Judy? (NOT Do we should . . . ?)
Should is followed by an infinitive without to.
Should I go? (NOT Should I to go?)
We often use should to talk about obligation, duty and similar ideas.
- People should drive more carefully.
You shouldn’t say things like that to Granny.
Should I . . . ?is used to ask for advice, offer help or ask for instructions. (Like Shall I …? )
- Should I go and see the police, do you think?
Should I help you with the washing up? What should I do?
We can use should to say that something is possible (because it is logical or normal).
- Henry should be here soon — he left home at six.
‘We’re spending the winter in Miami. ‘ ‘That should be nice. ‘
We can use [should + perfect infinitive] to talk about the past. This structure is used to talk about things which did not happen, or which may or may not have happened .
- [ should + have + past participle]
I should have phoned Ed this morning, but I forgot.
Ten o ‘clock: she should have arrived in her office by now.
- Should/would is a conditional auxiliary .
I should/would be very happy if I had nothing to do.