English virtual problems

1. About subjunctive subjunctive mood

There are four kinds:

1) subjunctive mood used in conditional subject-subject complex sentences (abbreviated predicate verbs that embody subjunctive mood);

2) The wish used in noun clauses is imaginary, and the predicate verb is expressed by (should) do;

3) It is used for the subjunctive adverbial clause of purpose guided by so that, in order that, and the predicate verbs are represented by can/could do, nay/might do;

4) It is used in slogans, slogans, prayers and proverbs to express personal wishes, and the predicate verb is embodied in the prototype of the verb.

Second, the answer to "How does the person who said this sentence know whether he is actually sick or not?"

Whether a sentence is subjunctive can be distinguished from the predicate verbs in the sentence, such as He looks as if he had been ill for long, and the had been ill in the clause has already told you that it is subjunctive to the past. It is also possible that this person is depressed, maybe weak, or even ill, but he is not sick. Since it is judged to be virtual, it means that it is contrary to the fact, that is, the illness is not real, which will be understood by obedient people or readers.

everyone speaks in a targeted way. Since he can say as if he had been ill for long, he will definitely know whether the other person is sick or not, and it is impossible to make irresponsible remarks. On the other hand, if he didn't know whether the other person was sick or not, he wouldn't have said such "irresponsible words", which is called spreading rumors and causing trouble.