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In a certain English sentence there should be concordance between tenses. But what does this exactly mean? Does that mean that if present perfect tense is used in the first part of a certain sentence then the second part of that sentence should also use present perfect tense or can that sentence use any aspect of present tense like progressive, perfect, indefinite, active voice, passive voice, etc?
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No, not necessarily-- they must just make sense in relation to each other.
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Mister MicawberNo, not necessarily-- they must just make sense in relation to each other.

Hi Mr Micawber,

What do you exactly mean? Do you mean that the combination of past and present can also be used?
 Marius Hancu's reply was promoted to an answer.
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