Present Simple or Present Continuous?

Let's learn about two different ways to describe things happening now (or around now): the present simple and the present continuous.
What is the difference?
Present Simple
We use this for:
Things that happen regularly or :
- I go to school every day.
- She takes the bus to work. (daily)
- He brushes his teeth twice a day.
Personal preferences, beliefs, things that are true about someone:
- She likes ice cream.
- I prefer coffee to tea.
- He believes in ghosts.
- We know French.
- I understand you.
Facts or general truths (are always true):
- Water boils at 100°C.
- The sun rises in the east.
- The Earth rotates around the Sun.
- Cats sleep a lot.
Schedules or timetables:
- The train leaves at 3 PM.
- The shop opens at 9 AM.
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Present Continuous
We use this for:
Things happening right now:
- I am writing an email. (now)
- They are playing football in the park. (now)
Temporary situations:
- I'm staying with my grandparents this week.
- She's working on a big project at the moment.
Future plans (that are already arranged):
- We're having dinner with friends tonight. (future)
- I'm flying to Paris next week. (future)
Easy Way to Remember:
- Present Simple is for things that are always true or happen regularly. It is often used with the following verbs: know, understand, think, believe, prefer, want or like, hate, also have (just to mention a few).
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- Present Continuous is for things happening now or around now. Interestingly, it can also refer to the future (an arranged plan)!
Examples to Compare:
"I play tennis." (Present Simple: I play regularly)
"I'm playing tennis." (Present Continuous: I'm playing right now)
"She works in a bank." (Present Simple: This is her job)
"She's working late today." (Present Continuous: Just for today)
"The Earth goes around the Sun." (Present Simple: Always true)
"The Earth is warming up." (Present Continuous: Happening these days)