SHOULD
SHOULDN'T

SHOULD/SHOULDN'T +BASE FORM

We use should or shouldn’t to give advice and to say what is or isn’t the right thing to do.

PRESENT

Affirmative form
(soggetto + should + base form)

I/you/he/she/it/we/you/they should buy more local food

Negative form
(soggetto + shouldn't + base form)

I/you/he/she/it/we/you/they shouldn't always buy pre-packaged products

Interrogative form
(Should + soggetto + base form)

Should I/you/he/she/it/we/you/they buy more local food?

We use should have + past participle when
we think that something (in the past) was a
good idea, but we didn’t do it.

Soggetto + should have + past participle

I/you/he/she/we/they should have used less plastic in the past

We use shouldn’t have + past participle when
we think something (in the past) wasn’t
a good idea, but we did it anyway.

Soggetto + shouldn't have + past participle

I/you/he/she/we/they shouldn't have used so much plastic in the past