$1$. A fan is running on the pitch at the moment.

`@` DHNB ''at the moment''

$⇒$ HTTD:

$-$ S $+$ am/is/are $+$ V-ing 

`***` pitch (n): sân bóng

$2$. Would you prefer BMX bikes or mountain bikes

$-$ Would $+$ S $+$ prefer $+$ N $+$ or $+$ N..?

`***` prefer sth or sth (v): thích cái này hay cái kia hơn

$3$. How often do you practice?

$-$ How often là Câu hỏi về thường xuyên

$-$ How often $+$ do/does $+$ S $+$ V inf

$4$. I don't think badminton is very interesting.

`@` HTĐ:

$-$ S $+$ do/does $+$ NOT $+$ V inf $+$ O

`***` badminton (n): cầu lông

$5$. She never watches sport on TV

`@` DHNB ''never'' $⇒$ HTĐ:

$-$ S $+$ V inf/ s,es

$\color{#00FFFF}{\text{#}}$$\color{#CCFF99}{\text{ᗩ}}$$\color{#99FF99}{\text{ꮮ}}$$\color{#33FF99}{\text{ꮖ}}$$\color{#00FF99}{\text{ꮑ}}$$\color{#99FFCC}{\text{ꭺ}}$$\color{#66FFCC}{\text{ꭺ}}$$\color{#00FF33}{\text{ꭺ}}$$\color{#00FFCC}{\text{ꭺ}}$$\color{#00FFFF}{\text{ꭺ}}$⭐

1) A fan is running on the pitch at the moment

-thì hiện tại tiếp diễn ( S+to be+ Ving)

2) would you prefer BMX bikes or mountain bikes ? 

- cấu trúc ( would+s+prefer + N ?) 

3)How often do you practise it ? 

- cấu trúc how often + aux verb + S + V 

4) i don't think badminton is very interesting 

- S+ do/does + not+ v + obj +.... 

5) she never watches sport on TV 

-xuất hiện never là chưa bao giờ phải dùng simple present 

-S+ V1/es/s