The sources, presented as an English learning episode, focus on teaching various expressions using the "to be + adjective/participle + to + base verb" structure. This specific grammar pattern is explained as being used to convey concepts such as obligation, ability, permission, willingness, and probability. Numerous examples demonstrate how these phrases function in sentences, and the material includes exercises for practice. The entire presentation is attributed to Professor Marcel de Freitas, highlighted as an experienced teacher focused on practical English communication.

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