Present and continous tense
The present tense is a grammatical tense whose principal function is to locate a situation or event in present time.[1] The term "present tense" is usually used in descriptions of specific languages to refer to a particular grammatical form or set of forms; these may have a variety of uses, not all of which will necessarily refer to present time. For example, in the English sentence My train leaves tomorrow morning, the verb form leaves is said to be in the present tense, even though in this particular context it refers to an event in future time. Similarly, in the historical present, the present tense is used to narrate events that occurred in the past.
There are two common types of present tense form in most Indo-European languages: the present indicative (the combination of present tense and indicative mood) and the present subjunctive (the combination of present tense and subjunctive mood).
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.

The present continuous, also called the present progressive, is one of the present tenses used in modern English, the others being the simple present and the emphatic present. All of these can be employed in both the indicative and subjunctive moods.
Common uses
The present continuous is used in several instances.
To describe something which is happening at the exact moment of speech:
The boy is crying.
To describe an action that is taking place now, but not at the exact moment of speech:
He is working in Dubai.
To describe an event which is planned in the future:
I'm resitting my French exam on Tuesday.
With always, but meaning often:
My mother is always making me go to school!
She is always playing with that doll!
Formation
To form the present continuous, one uses the appropriate conjugation of to be from the simple present and puts the present participle of the chosen verb after. For example:
He is playing
When using the interrogative with the present continuous, one does not use the verb to do as with the simple present, rather, one swaps the positions of the conjugation of to be and the present participle. For example:
Am I annoying you? which is to ask whether I am annoying you.

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