1, which means the opposite of the present fact: clause: If subject+past tense (Be verb is we) main sentence: subject +should/would/could/may+do.
If the subject +have+done main sentence: subject +should/would/could/may+done.
3. Subjective speculative clauses about the future: ①if+ subject +would to do main sentence: ① subject +Should/Could/may+Do2IF+ subject++did/weres② subject +Should/Could/may+Do3IF+ subject +Should+Do3 subject+
Question 2: When does if guide conditional adverbial clauses and when does subjunctive mood IF guide the classification of conditional adverbial clauses and the judgment of subjunctive conditional sentences?
1, conditional sentences can be divided into two categories:
1). Real conditional sentence: The hypothetical situation is a real condition. For example:
If I have time, I will help you with the work.
As long as I say something wrong, you must point it out. As long as I am wrong, you must point it out.
If time permits, we will go fishing together. If we have time, we will go fishing together. )
2). Unreal conditional sentence: when it is assumed that it cannot be realized, it is a virtual conditional sentence. For example:
If I were you, I would attend the meeting. If I were you, I would attend the meeting.
If he had been here yesterday, he would have met his old friend. If he had come yesterday, he would have met his old friend.
If it had rained yesterday, we would have stayed at home.
2. The judgment of subjunctive mood. If conditional adverbial clause
Judge whether it is a true conditional sentence or a false conditional sentence. Only use subjunctive mood in unreal conditional sentences. See if the hypothetical condition can be realized through sentence meaning. It's a true conditional sentence, so you can't use subjunctive mood. If the hypothetical condition cannot be realized, it is an untrue conditional sentence, and the subjunctive mood should be used.
To judge which fact this hypothesis is contrary to, there are usually three situations: ① contrary to the past facts; ② Contrary to the present facts; (3) may be contrary to the future facts.
Step 3 "step back"
Taking a step back refers to taking a step back in the subjunctive mood after accurately judging which fact the sentence is contrary to. That is, in an untrue conditional adverbial clause, the predicate verb "takes a step back" according to the normal situation. That is:
Contrary to the past facts, it is expressed in the past perfect tense in the clause.
Contrary to the present fact, it is expressed in the past simple tense form in the clause.
May be contrary to the future facts, expressed in the past future tense form in the clause.
In the main sentence, modal verbs such as would, should, could, etc. Used to add verb forms consistent with clauses. Example:
If I had seen her yesterday, I would have seen him.
If I were a teacher, I would be strict with my students.
In case it snows tomorrow, they can't go out.
4. Preventive measures
If there are were, should, had had in the if conditional sentence, you can omit if and use the inverted word order.
(2) In modern English, if the predicate verb in the conditional and clause is be, its past tense is generally used as were.
Question 3: When is the subjunctive mood inverted in the subjunctive conditional sentence guided by 3:if? If the clause contains were, should, had done, if omitted, it should be reversed.
If I were you, I wouldn't do it.
If I were you, I wouldn't do it.
If it rains tomorrow, we won't go for an outing.
If it rains tomorrow, we won't go for an outing.
If he had driven carefully, the accident would not have happened.
If he had driven carefully, the accident would not have happened.
Question 4: When do you basically understand that the word persistence has two meanings in subjunctive mood? By that time, these two meanings are very close, so it is better to understand the context of the sentence meaning directly:
When persistence means "someone insists on doing something", it means that something has not happened when this person insists, but this person has made up his mind to do it. It can be simply understood as "what he insists on hasn't happened yet" She insists that we leave at 6 o'clock tomorrow, otherwise we may miss the flight. This sentence is what she insists that everyone should do tomorrow, empty.
When persistence means "someone insists on saying what something looks like", it means that something has happened when someone insists, and this person is just providing a message (maybe the truth, maybe a lie) to the listener, which can be simply understood as "what he insists on has happened". At this point, use the normal tense. Little Tony insisted that he saw a man flying in the sky last night. This sentence happened last night, and the child insisted that what he witnessed at that time (which may be true or false) was not necessarily virtual.
Question 5: How to use subjunctive mood? When can I use it? The subjunctive mood is used to express the speaker's subjective wishes or assumptions, not the objective facts. It is a condition, not necessarily a fact, or contrary to the fact. That is, when a person wants to emphasize that what he says is based on his own subjective thoughts, wishes, assumptions, guesses, doubts or suggestions, rather than on objective reality, he uses subjunctive mood.
1, which means the opposite of the present fact: clause: If subject+past tense (Be verb is we) main sentence: subject +should/would/could/may+do.
If the subject +have+done main sentence: subject +should/would/could/may+done.
3. Subjective speculative clauses about the future: ①if+ subject +would to do main sentence: ① subject +Should/Could/may+Do2IF+ subject++did/weres② subject +Should/Could/may+Do3IF+ subject +Should+Do3 subject+