http://e-flt.nus.edu.sg/v1n12004/tschirner.htm
Breadth of vocabulary and advanced English study: An empirical investigation
Erwin Tschirner
Ser Conjugation: All Tenses, Explained Simply (with Examples)
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A complete guide to conjugating ser, one of Spanish's most essential and
irregular verbs. Covering every tense from present to subjunctive, with
clear ta...
4 days ago
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