Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

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Wh + am/is/are + S + V3/ed? (bị động - thì HTĐ)

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How often: tần suất 

What: cái gì 

When: khi nào

Where: ở đâu 

Why: tại sao 

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1. How often are The Olympic Games held?

2. What are the children playing?

3.

C1: Where did the first Olympic Games take place in 776 BC?

C2: When did the first Olympic Games take place in Greece?

4. When did Pele begin his career?

5. Why do you really like swimming? 

`color{orange}{~LeAiFuRuiHuiBao~}`