“Should/shouldn’t” are used to give advices or to make suppositions. This modal doesn’t change in the third person singular.

Use Examples
To give advices You should avoid eating all that junk food. It’s unhealthy!

We should listen to his advice and stop complaining.

To suggest someone not to do something She shouldn’t be so friendly with him. He might take advantage of her.

You shouldn’t play with the on/off button. The radio may break down.

To make suppositions I can feel a strong air current. The way out of the tunnel should be close.
Modals – should/shouldn’t

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