There are three main structures of subjunctive conditional sentences:
1) means contrary to the present situation: what is the predicate of the main clause? Would/could/may+ verb prototype? What is the predicate of the clause? The simple past tense of verbs? The past tense of the verb be always uses were.
If I were you, I wouldn't accept his proposal.
If I have time, I will definitely go to the movies with you.
2) Contrary to the past: the use of the main clause predicate? Would/could/may+have+ past participle. The clause predicate is the past perfect tense.
If I get up earlier, I won't? T miss the train.
If I had been more careful, I might have passed the exam.
3) Contrary to the future situation: is the subject a predicate? Would/could/may+ verb prototype? What is the predicate of the clause? Were+ infinitive? Or? Should+ verb prototype? .
If I do this job, I won't have enough time to study.
If it rains tomorrow, I won't go out with you.
Basic grammar knowledge of College English Band 6 and Band 2. Omission of connectives if in subjunctive conditional sentences.
If there are words such as was, had, should and could in the clauses of the subjunctive conditional sentence, the conjunction if can be omitted, but at this time the words such as was, had, should and could must be moved to the front of the subject to form an inversion. This sentence pattern is mainly used in written language.
If I do the work, I will finish it in two weeks.
Without his help, we couldn't. T get there on time.
In case it rains tomorrow, I will stay at home.
3. Predicate components in object clauses after 3.wish
The object clause after the verb wish indicates an unfulfilled or impossible wish. The predicate verb in the object clause should use subjunctive mood, which has the following three forms.
1) indicates a wish that cannot be realized now, and the predicate verb in the object clause uses the simple past tense. The past tense of be is were.
I wish I had enough money to buy a car.
I wish I were as young and energetic as you.
2) To express an unfulfilled wish in the past, the predicate verb in the object clause uses the past perfect tense (had+ past participle) or? Would/could+have+ past participle. .
I wish I had? T make such a mistake.
I wish I could do better.
3) Express an impossible wish in the future. Would/should (could, may)+ verb prototype? .
I hope I won't get old.
I hope I can travel around the world one day.
Basic grammar knowledge of College English Band 6 and Band 4. The predicate verbs in the object clauses after some verbs should use subjunctive mood.
In some object clauses after verbs, the predicate verbs should use subjunctive mood. At this time, the predicate verb uses the verb prototype or should+ verb prototype. These verbs generally represent concepts such as command, demand, decision, suggestion and proposition. , mainly including: suggestions, inquiries, orders, decisions, demands, desires, commands, persistence, movement, orders, proposals, suggestions, demands, demands, suggestions, etc.
The workers demanded a pay increase of 10%.
The teacher decided that you should do the experiment first.
5. Some predicate verbs in predicative clauses and appositive clauses after nouns should use subjunctive mood.
In some predicative clauses and appositive clauses after nouns, the predicate verbs should use subjunctive mood. At this time, the predicate verb uses the verb prototype or should+ verb prototype. These nouns generally represent concepts such as orders, demands, decisions, suggestions, propositions, etc., mainly including: suggestions, ideas, instructions, motions, orders, plans, proposals, suggestions, requests, demands, suggestions, etc.
My suggestion is that we should call a doctor at once.
He ordered them to do the experiment again.
Basic grammar knowledge of CET6. Complex time conditional sentence
Sometimes the actions expressed in conditional sentences are inconsistent with those expressed in main sentences. For example, a clause is an assumption about the past, while a main clause may be an assumption about the present. This kind of sentence is called a complicated conditional sentence of time.
If the weather is better, the crops will grow better.
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