Rewrite the following sentences, putting the frequency expressions in the right place. They are happy to have guests ( always) We laugh at people in trouble ( never) I'm busy on Wednesdays. ( usually) Birds build their nests on this roof. ( every winter) They sing very loudly. ( generally) Dalit is late for school. ( rarely) My parents help me with my homework. ( hardly ever) My parents visit us. (from time to time) We are at home on Saturdays. (often) The secretary works here. (five days a week) We have fish for lunch. (sometimes) Sharon has lunch before two o'clock. (seldom)

1. They are always happy to have guests.
2. We never laugh at people in trouble.
3. I'm usually busy on Wednesdays.
4. Birds build their nests on this roof every winter.
5. Generally, they sing very loudly.
6. Dalit is rarely late for school.
7. My parents hardly ever help me with my homework.
8. My parents visit us from time to time.
9. We are often at home on Saturdays.
10. The secretary works here five days a week.
11. We sometimes have fish for lunch. 
12. Sharon seldom has lunch before two o’clock.

  Dấu hiệu 'Hiện tại đơn - present perfect': always; usually; often; sometimes; frequently; seldom; rarely; hardly;...

    Động từ dạng 'to be':

Cấu trúc hiện tại đơn - khẳng định: S + am/ is/ are + N/ Adj

Cấu trúc hiện tại đơn - phủ định: S + am/ is/ are + not + N/ Adj

Cấu trúc hiện tại đơn - nghi vấn: Am/ Is/ Are + S + N/ Adj?

 Lưu ý: S = I + am.

            S = He/ She/ It + is.

            S = You/ We/ They + are.

   Động từ dạng thường:

Cấu trúc hiện tại đơn - khẳng định: S + V(s/ es) +…

Cấu trúc hiện tại đơn - phủ định: S + do/ does + not + V(nguyên mẫu) +…

Cấu trúc hiện tại đơn - nghi vấn: Do/ Does + S + V(nguyên mẫu) +… ?

Lưu ý: S = I/ We/ You/ They/ Danh từ số nhiều + do + not

           S = He/ She/ It/ Danh từ số ít + does + not

`1.` They are always happy to have guests.

`2.` We never laugh at people in trouble.

`3.` I'm usually busy on Wednesdays.

`4.` Birds build their nests on this roof every winter.

`5.` They generally sing very loudly. 

`6.` Dalit is rarely late for school.

`7.` My parents hardly ever help me with my homework.

`8.` My parents visit us from time to time.

`9.` We are often at home on Saturdays.

`10.` The secretary works here five days a week.

`11.` We sometimes have fish for lunch.

`12.` Sharon seldom has lunch before two o'clock.

`××××××××××××`

`—` Vị trí Adv : Sau `T`obe/`T`rợ động từ, trước `Đ`ộng từ. 

`—` DHNB : Always, often, usually, sometimes, rarely, ....

`-` `H`iện Tại Đơn – `Đ`ộng từ thường:

`(+)` S + V(s/es) + O.

`(-)` S + don't/doesn't + V.

`(  ?  )`  Do/does + S + V`?`

– She/he/it/Danh từ số ít/Danh từ không đếm được `+` Vs/es.

– I/we/you/they/Danh từ số nhiều  `+` V.

+ She/he/it/Danh từ số ít/Danh từ không đếm được `+` Does/doesn't 

+ I/we/you/they/Danh từ số nhiều `+` Do/don't. 

`-` `H`iện Tại Đơn – `Đ`ộng từ tobe :

`(+)` S + am/is/are + O.

`(-)` S + isn't/aren't/am not + O.

`(  ?  )`  Is/are + S + O?

– I `+` am/am not.

– She/he/it/Danh từ số ít/Danh từ không đếm được `+` Is/isn't 

– We/you/they/Danh từ số nhiều `+` Are/aren't