simple present tense
In English grammar, the simple present tense is a form of the verb that refers to an action or event that is ongoing or that regularly takes place in present time.
In English grammar, there are seven accepted functions of the usage of the simple present for of verbs: to express permanent states, general truths, habitual actions, live commentary, performative actions, past time or historic present, and future time.
Permanent state: Jupiter is a very massive planet.
2) General truth: The earth is round.
3) Habitual action: Her daughter works in Rome.
4) 'Live' commentary: In each case I add the two numbers: three plus three gives six . . ..
5) Performative: I pronounce you man and wife.
6) Past time (see historic present): He moves to the window alongside, and sees her inside the office moving away from the door. He shoots twice through the window and kills her.
7) Future time: My flight leaves at four thirty this afternoon."
simple past tense
In English grammar, the simple past is a verb tense (the second principal part of a verb) indicating action that occurred in the past and which does not extend into the present.
The simple past tense (also known as the past simple or preterite) of regular verbs is marked by the ending -d, -ed, or -t. Irregular verbs have a variety of endings. The simple past is not accompanied by helping verbs.
simple future tense
In English grammar, the future is a verb tense (or form--see the notes by Pinker and Rissanen below) indicating action that has not yet begun.
There is no separate inflection (or ending) for the future in English. The simple futureis usually expressed by placing
the auxiliary will or shall in front of the base form of a verb ("I will leave tonight"). Other ways to express the future include (but are not limited to) the use of:
a present form of be plus going to: "We are going to leave."
the present progressive: "They are leaving tomorrow.
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