Not "Amina reads, right this minute." — say "Amina is reading, right this minute.". 说此刻的事要用 is + reading，不是动词原形。
每天都做
说一个习惯性、一再重复的动作，用动词原形（he/she/it 加 -s）。
Amina reads every evening.
Hiroshi takes the bus to work.
We play football on Sundays.
Not "Amina is reading every evening." — say "Amina reads every evening.". 反复做的习惯要用一般现在时 reads，不是 is + reading。
Am, is, are
跟着主语来搭配：I am + -ing，he / she / it is + -ing，you / we / they are + -ing。以 -e 结尾的动词：去掉 e 再加 -ing：write → writing，make → making。
I am eating my lunch.
He is writing. (write → writing)
You are playing.
Not "She are writeing." — say "She is writing.". he / she / it 搭配 is（不是 are），write 要去掉 e：writing，不是 "writeing"。
试一试: She ___ reading a book right now. (is / are / am) 答案: is — he / she / it 搭配 is：She is reading. are 是给 you / we / they 用的，am 只给 I 用。
试一试: He is ___ a letter. (writing / writeing / writting) 答案: writing — "Write" 以 e 结尾，所以加 -ing 前要去掉 e：writing（不是 "writeing"）。
加 -s 还是 -es
说 he / she / it 的习惯时，动词原形要加 -s：read → reads。有些动词加 -es：go → goes，watch → watches，do → does。
She reads every evening.
He goes to work by bus. (go → goes)
Mei watches TV after dinner. (watch → watches)
Not "He gos to work." — say "He goes to work.". go 要加 -es：goes，不是 "gos"。
试一试: He ___ to work by bus every day. (goes / gos / go) 答案: goes — he / she / it 的时候，go 要加 -es：goes（不是 "gos"）。词尾要保留——用 he 的时候，别直接用原形 "go"。
表示否定
说此刻的事，否定用 am not / isn't / aren't + -ing。说习惯，否定用 don't / doesn't + 动词原形。
Amina isn't reading now.
The children aren't playing.
Amina doesn't read in the morning.
We don't play on Mondays.
Not "Amina doesn't reading now." — say "Amina isn't reading now.". 此刻的事用 isn't + reading。习惯用 doesn't + read（动词原形）。
提问
问此刻正在发生的事，开头用 Am / Is / Are + 主语 + -ing? 问习惯，开头用 Do / Does + 主语 + 动词原形?
Is she reading?
Are they playing?
Does he go to the gym?
Do you read at night?
Not "Does she reading now?" — say "Is she reading now?". 此刻的事用 Is / Are + -ing。习惯用 Do / Does + 动词原形。
试一试: 看看 Amina。她翻开一本书，眼睛盯着书页。 此刻发生的是哪一个？ (She is reading. / She reads.) 答案: She is reading. — 她此刻正在做这件事，所以用 is + reading。"She reads" 会表示这是她常做的习惯，而不是你看到她此刻正在做的事。
试一试: Hiroshi 每周一、三、五都去健身房，一再重复。 哪句描述的是他的习惯？ (He goes to the gym. / He is going to the gym.) 答案: He goes to the gym. — 他反复做的习惯 → 用一般现在时 goes。"He is going" 是此刻正在发生的一件事，不是他一再重复做的事。
试一试: 看看 Mei。她坐在书桌前，手里拿着一支笔。 Mei 午饭后总是在笔记本上写字，一再重复这样做。 把每一句配对起来。哪个形式适合每个情境？ 答案: 看看 Mei。她坐在书桌前，手里拿着一支笔。 → 1 → She is writing. · 2 → She writes. Mei 午饭后总是在笔记本上写字，一再重复这样做。 → 1 → She writes. · 2 → She is writing. — 此刻正在做的事 → is writing。她反复做的习惯 → writes。是当下的情境决定用哪个形式，所以第一句是 is writing，第二句是 writes。
试一试: Hiroshi 每周一、三、五都去健身房。你想问一问这个习惯。 该怎么问他的习惯？ (Does he go to the gym? / Is he going to the gym?) 答案: Does he go to the gym? — 他一再重复的习惯 → 用 Does + go 来问。"Is he going?" 问的是此刻正在发生的一件事，不是他的习惯。