The present indicative of most verbs in modern English has the same form as the infinitive, except for the third-person singular form, which takes the ending -[e]s. The verb be has the forms am, is, are. For details see English verbs. For the present subjunctive, see English subjunctive. A number of multi-word constructions exist to express combinations of present tense with aspect. The basic form of the present tense is called the simple present; there are also constructions known as the present progressive (or present continuous) (e.g. am writing), the present perfect (e.g. have written), and the present perfect progressive (e.g. have been writing).
Use of the present tense does not always imply present time. In particular, the present tense is often used to refer to future events (I am seeing James tomorrow; My train leaves at 3 o'clock this afternoon). This is particularly the case in condition clauses and many other adverbial subordinate clauses: If you see him,...; As soon as they arrive... There is also the historical present, in which the present tense is used to narrate past events.
For details of the uses of present tense constructions in English, see Uses of English verb forms. The formula: Positive: S + V1 (s / es) Negative: S + DO / DOES + NOT + V1 Question: DO / DOES + S + V1
It is used to express an action in present time, habitual or usual actions or daily event or universal fact. It is used to express an action in present time which is usually done on a regular basis.
For example a student says, “I go to school”. It is a daily activity of a student to go to school, so such actions are expressed by present simple tense. Another example is, “I work in a factory”. It tells about a usual action of a person that he works in a factory on regular basis.
Positive Sentence
Examples; He gets up early in the morning.
Negative Sentences
Examples; He does not get up early in the morning.
Note: In negative sentence auxiliary verb “do or does” along with “not” is used. If the subject in a sentence is “he, she, it, singular or proper noun”, then “Does not” is used after subject in sentence. If subject is “I, we, they, you or plural” then “Do not” is used after subject in sentence. “s” or “es” is not added to main verb in negative sentence
Interrogative Sentence
Examples; Does he get up early in the morning?
Note: If the subject in a sentence is “he, she, it, singular or proper noun” the sentence is started with Auxiliary verb “Does”. If the subject in a sentence is “I, we, they, you or plural” the sentence is started with auxiliary verb “Do”. “s” or “es” is not added to main verb in Interrogative sentence
Positive Sentences
Water maintains its surface level.
Negative Sentences
Water does not maintain its surface level.
Interrogative Sentences
Does water maintain its surface level?
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