ATC and Pilots use a subset of language, they get by with mostly the same 200 words and the formats of most calls is largely the same. So you know what to expec

ATC and Pilots use a subset of language, they get by with mostly the same 200 words and the formats of most calls is largely the same. So you know what to expect. Additionally, ATC and Pilots require readback, ie you say what you understood. Only when ATC understands your readback will they assume you understood anything.