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Modal verbs probability exercise 1 - choose + infinitive + + participle. Updated 7-30-12 modal perfect tenses modal perfect tense unknown subject performed action , ’ . Eslflow' guide teaching continuous, perfect modal activities & lesson plans. Future perfect simple continuous tense ( , ). online + pdf exercises + grammar rules examples.. Pesent perfect simple continuous tense ( , ): online + pdf exercises + grammar rules examples. students teachers english..