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When the condition refers to the past, but the consequence to the present, the condition clause is in the past perfect (as with the third conditional), while the main clause is in the conditional mood as in the second conditional (i.e. simple conditional or conditional progressive, but not conditional perfect).
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In predictive conditional sentences, the future tense or imperative generally appears in the main clause, but the condition clause is formed with the present tense (as in English). This contrasts with subordinate clauses introduced by certain other conjunctions, such as quand ("when"), where French uses the future (while English has the present).
Professor Whitney in his Essentials of English Grammar recommends the German original stating "there is an English version, but it is hardly to be used." (p. vi) Meyer-Myklestad, J. (1967). An Advanced English Grammar for Students and Teachers. Universitetsforlaget-Oslo. p. 627. Morenberg, Max (2002). Doing Grammar, 3rd edition. New York ...
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A condition can be both necessary and sufficient. For example, at present, "today is the Fourth of July" is a necessary and sufficient condition for "today is Independence Day in the United States". Similarly, a necessary and sufficient condition for invertibility of a matrix M is that M has a nonzero determinant.
The English subjunctive is realized as a finite but tenseless clause.Subjunctive clauses use a bare or plain verb form, which lacks any inflection.For instance, a subjunctive clause would use the verb form "be" rather than "am/is/are" and "arrive" rather than "arrives", regardless of the person and number of the subject.
A typical English verb may have five different inflected forms: . The base form or plain form (go, write, climb), which has several uses—as an infinitive, imperative, present subjunctive, and present indicative except in the third-person singular