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Lose (with one o) is the common verb meaning not to be able to find. Loose (with double o) is an adjective meaning unfastened, free: The horse was loose in the field.
Use the definite article before the names of musical instruments.
As a rule, don't use the definite article before the names of diseases.
The indefinite article is needed with common names of illnesses: I was suffering from a cold (a fever, a cough, a headache).
Persuade and convince have very similar meanings and are mostly interchangeable in modern English: Delia persuaded me to take the exam = Delia convinced me to take the exam. Except in the case of to be convinced of something meaning to believe something.
Care must be taken not to confuse persuade with pursued, the past tense of pursue (= to follow).