Tenses Overview

Tenses is category that locates a situation in time, to indicate when the situation takes place. Tense is the grammaticalisation of time reference, often using three basic categories of "before now", i.e. the past; "now", i.e. the present; and "after now", i.e. the future. The "unmarked" reference for tense is the temporal distance from the time of utterance, the "here-and-now", this being absolute-tense. Relative-tense indicates temporal distance from a point of time established in the discourse that is not the present, i.e. reference to a point in the past or future, such as the future-in-future, or the future of the future (at some time in the future after the reference point, which is in the future) and future-in-past or future of the past (at some time after a point in the past, with the reference point being a point in the past).

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Intinya adalah bahwa tenses berarti perubaan kata kerja (verb) yang mempengaruhi waktu dan terjadinya peristiwa. Hal ini berarti bahwa kata kerja (verb) dalam bahasa inggris  mempunyai peranan penting untuk mengetahui kapan suatu pristiwa terjadi walaupun tanpa penanda waktu (time signal). 

contoh:  - They study English everyday

             - They will study English tomorrow

             - They studied English yesterday

             - They are studying English now

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For further, u can check here. This lesson offers a quick overview of the main verb tenses in English. It also explains which are the most important to master at various language levels