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What’s the difference between modals and the English subjunctive?

1. “He should go”. = “It is necessary that he go”.

Is the sentence with the modal a subjunctive? If not, what is it?

And what about the other modals, “can, would, could, will”.

Also, in the imperative mood:

1. “Do your homework!”

2. “You must do your homework!”

3. “It is required that you do your homework!”

What are the sentence moods of the above sentences?

Basically, I need to know the difference between modals and the subjunctive/imperative mood. Thanks.
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BlackBlitzWhat’s the difference between modals and the English subjunctive?
Modal verbs are often found in sentences with the subjunctive, but not always. Modal verbs can be used in A LOT of different ways and situations, so it depends.
BlackBlitz1. “He should go”. = “It is necessary that he go”.



Is the sentence with the modal a subjunctive? If not, what is it?
I don't think that's a subjunctive, and I really don't know what it is, LOL. I just call it "suggestion-should": He should go => He'd better go => I suggest he go...
BlackBlitzWhat are the sentence moods of the above sentences?
1 = Imperative
2 & 3 = Indicative

But that's just my opinion, I don't really know what to call all that grammar stuff. Emotion: smile
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This link gives a comprehensive description of the subjunctive mood.
There is a consistent relationship with the subjunctive and the modal "would" (the verbs in the subjunctive mood are in yellow)

If I were you, I would read the referenced link. >> Past subjunctive in the if-clause, modal "would" + present in the main clause.
If I had known the link location, I would have posted it. >> Past perfect subjunctive in the if-clause, would + present perfect in the main clause.

In expressing wishes, the modal would + subjunctive can be used:

I wish you would stop talking so loud. >> (a wish for the future; modal "would")

She wished that he had asked her to marry him. >>(a wish for the past)
I wish you were here with me. >> (a wish for the present)