The subjunctive is a verb form which does not take -s in the third person singular.
It is possible to use the subjunctive in that clauses after words suggesting that something is necessary or preferable.
✓ The doctor suggested that Sam take some time off work.
✓ It is very important that Greg not know about this.
The subjunctive forms for be are I be, you be, etc.
✓ It's absolutely essential that I be informed as soon as the President arrives.
We can also use should.
✓ The doctor suggested that Sam (should) take some time off work.
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