Grammar - 句子的时态
语法要点
Simple Present Tense（一般现在时）
用来表示习惯、日常动作，或者永远成立的事实。常见关键词：every day, always, usually, often, sometimes, never。
I eat rice every day.
She drinks milk every morning.
He goes to school by bus.
We play football on Sundays.
The sun rises in the east.
Birds fly in the sky.
My mum cooks dinner every night.
It rains a lot in Singapore.
The dog likes to run and play.
They live near the park.
Present Continuous Tense（现在进行时）
用来表示现在正在发生的动作。常见关键词：now, right now, at the moment, look!, listen!
I am eating rice now.
She is drinking water.
He is running in the park.
We are playing football.
They are singing a song.
Mum is cooking dinner.
The dog is sleeping on the sofa.
Look! It is raining!
He is doing his homework.
I am reading a book right now.
Simple Past Tense（一般过去时）
用来表示过去已经发生、已经完成的动作。常见关键词：yesterday, last night, last week, ago, just now。
I ate rice for lunch.
She drank two glasses of milk.
He ran to school this morning.
We played football yesterday.
They sang a song at the concert.
Mum cooked dinner last night.
The dog slept on the sofa all day.
It rained heavily this afternoon.
He did his homework after school.
I read a book last night.
容易搞错的地方
Simple Present: I eat / She eats
一般现在时 — 描述习惯，每天都这样
She drinks milk every morning.
Present Continuous: I am eating / She is eating
现在进行时 — 此刻正在发生的动作
She is drinking milk right now.
Simple Present: He plays football.
一般现在时 — 现在或习惯性的动作
He plays football every Sunday.
Simple Past: He played football.
一般过去时 — 过去已完成的动作，动词加 -ed
He played football yesterday.
Present Continuous: She is running.
现在进行时 — 她现在正在跑
She is running in the park now.
Simple Past: She ran.
一般过去时 — 她之前跑了（已经结束）
She ran very fast this morning.
总结
"Simple Present（一般现在时）— habits and facts, use base verb — I eat, she eats"
"Present Continuous（现在进行时）— happening right now, use am/is/are + verb-ing — I am eating"
"Simple Past（一般过去时）— already done, use past form — I ate, I played"
"Key words for Simple Present: every day, always, usually, often, never"
"Key words for Present Continuous: now, right now, look!, listen!, at the moment"
"Key words for Simple Past: yesterday, last night, last week, ago, just now"