Is this sentence gramatically correct?
It is essential that no one leaves the building until the police have checked everyone’s identity
“Have checked” part looks strange to me
This is an example of the subjunctive in English, which a lot of people, even native speakers, don't use correctly, but is still correct. I use it when it is called for, but I guess the situation doesn't present itself very often. I might use it once a week or so.
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This is an example of the subjunctive in English, which a lot of people, even native speakers, don't use correctly, but is still correct. I use it when it is called for, but I guess the situation doesn't present itself very often. I might use it once a week or so. After certain vocabulary words like "demand, suggest, or in an if clause, we use the past tense form for the