How and when to use the present subjunctive in Spanish?
The Spanish subjunctive is a mood and not a tense.
It is used in many different occasions:
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When the subject of the clause changes e.g. I want her to go to the shop
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After a verb that expresses a wish, desire, preference, suggestion, or a request. e.g. My mum hopes that I can go to university.
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After a verb that expresses doubt, fear, joy, hope, sorrow and other emotions. e.g. I doubt that he will succeed.
4.After impersonal expressions that show necessity urgency, importance or possibility e.g It is important that we study for our exam.
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After certain conjunctions of time such as antes (de) que, cuando, en cuanto, hasta que e.g. I will stay here until he returns.
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If the noun before the adjective is indefinite, vague, negative or nonexistent. e,g I'm looking for a book that is intteresting.
How to form the present subjunctive with regular verbs:
You go to the present indictative , the first person singular and you drop the 'o' ending and add for -ar verbs: e, es, e, emos, éis, en and for -er/ ir verbs: a, as, a, amos, áis, an.
There are irregular verbs that you need to memorise. These verbs include dar, ir, salir, hacer, estar, ser.