The simple present tense is used to describe actions, events, or situations that are habitual, general truths, or regularly occurring. It is also used to state facts and fixed arrangements.

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The structure of the simple present tense is:

Subject + base form of the verb (for most subjects)

- For third-person singular subjects (he, she, it), add -s or -es to the base form of the verb.

Usage of simple present tense - 

1. To express habitual actions or routines  
   - Example: She drinks coffee every morning.
     - (This shows a regular habit.)

2. To state general truths or facts  
   - Example: The sun rises in the east.
     - (This is a scientific fact that doesn’t change.)

3. To talk about scheduled events or fixed arrangements (often for timetables)  
   - Example: The train leaves at 6 p.m.
     - (This is a fixed schedule.)

4. To describe feelings, opinions, and states  
   - Example: I like chocolate.
     - (This is a personal preference or state.)

5. For instructions or directions  
   - Example: You turn left at the next street.
     - (Used to give directions.)

Examples of simple present tense
- I walk to work every day.
- They play soccer on Saturdays.
- He watches the news every night.
- Water boils at 100 degrees Celsius.
- The bus arrives at 7:30 a.m.

Time Expressions Often Used
Common time expressions with the simple present tense include:
- always, often, usually, sometimes, never (for frequency)
- every day, every week, every month
- on specific days: on Mondays, on weekends
- in the morning, afternoon, evening

 Key Points - 
- Describes habitual actions, general truths, and scheduled events.
- Requires the base form of the verb, with -s or -es added for third-person singular subjects.
  
The simple present tense is straightforward and commonly used to talk about regular activities, facts, and schedules.