Grammar Min

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Grammatical minimum for ICAO English test (4,5 level).

Operational 4
Basic grammatical structures and sentence patterns are used creatively and are usually well controlled. 
Errors may occur, particularly in unusual or unexpected circumstances, but rarely interfere with meaning.

Extended 5
Basic grammatical structures and sentence patterns are consistently well controlled.
Complex structures are attempted, but with errors which sometimes interfere with meaning.

So we have Basic grammatical structures and Complex structures.