Facts, generalizations and universal truths （事实，结论，普遍真理） Habits and routines （习惯和日常活动） Permanent situations （不变的情况） Events that are certain to happen （一定要发生的事件） Arrangements that we can‘t change (e.g. timetables, official meetings) （不能改变的安排）
about something or somebody.

Water boils at 100 degrees Celcius. Universal Truth It is a big house. Fact The Earth goes around the Sun. Universal Truth, Fact Dogs are better than cats. Generalization The Elephant doesn't fly. Fact London is the capital city of France. Fact (Remember: the sentence does not have to be true)

Use 4: Events Certain to Happen

Use the Present Simple when an event is certain to happen in the future.

My grandmother turns 100 this July. Winter starts on December 21.
Look at these examples with the main verb like:
Subject I, you, we, they Auxiliary verb Main verb play plays do does I, you, we, they he, she, it not not play play play play football. football. football. football. football? football?
Simple Present Tense
现在进行时
How do we make simple present tense （构成）





subject+auxiliary verb+main verb 主语+情态动词+主动词 do base For positive sentences, we do not normally use the auxiliary. For the 3rd person singular (he, she, it), we add s to the main verb or es to the auxiliary. (does) If the verb ends in -ss, -sh, -ch, -x or -o, add -es to the base form: kiss - kisses, finish - finishes, watch - watches, mix - mixes, go – goes If the verb ends in consonant + y change y to i and add -es: study - studies, copy - copies, try - tries, carry - carries For the verb to be, we do not use an auxiliary, even for questions and negatives. (see table 2) Auxiliary verbs "do," "have", which can also be used as main verbs, to do to have I/you/we/they do I/you/we/they have he/she/it does he/she/it has
+
He, she, it I, you, we, they
-
He, she, it Do
？ Does
Look at these examples with the main verb be. Notice that there is no auxiliary:
Subject
I
Main verb
am are is Chinese. Chinese. Chinese.
+
You, we, they He, she, it
I
am are
is I you, we, they he,she,it
not not
not
Chinese. Chinese.
Chinese. late? late? late?
-
You, we, they
He, she, it Am
?
Are Is
When do we use simple present tense （何时使用）
Use 2: Habits and Routines

We also use this tense to describe actions that happen frequently. For example: habits, routines.


We leave for work at 7:30 AM every morning. Routine
Use 5: Future Arrangeme to talk about events that we
can't change (for example, an official meeting or a
train departure).

Adverbs of Frequency The Present Simple is often used with the frequency adverbs: always frequently/often usually seldom/rarely nowadays never every week/year sometimes/occasionally from time to time every now and then A few examples how to use them in sentences: I always go to church on Sundays. I never eat anything after 10 PM.

We use the Present Simple to talk about universal truths (for example, laws of
nature) or things we believe are, or are not, true. It's also used to generalize

"A man goes to visit a friend and is amazed to find him playing chess with his dog. He watches the game in astonishment for a while [...]"

State verbs (e.g. be, have, suppose, know) （静态动词）
Narrations, instructions or commentaries （叙述，说明或评论解说）
Use 1: Facts, Generalizations and Univeral Truths
The meeting starts at 4 PM. The train leaves at the noon. When does the plane take off? Jerry doesn't teach maths at high school.

Use 6: Narrations, Instructions or commentaries
The Present Simple is also used in narrations (e.g. to tell a story or a joke), instructions (e.g. cooking) or commentaries (especially sport commentaries).
Use 3: Pernament Situations

Use the Present Simple to talk about situations in life that last a
relatively long time.

I live in Boston He works as a fireman. Margaret drives a Volkswagen. Jerry doesn't teach maths at highschool.
My husband watches the TV in the evening. Habit, Routine Susan often meets with her friends after school. Habit, Routine They usually play football on Sunday. Habit, Routine